diff --git a/core/embed/rust/Cargo.lock b/core/embed/rust/Cargo.lock
index 114e08484e..70ce5e4281 100644
--- a/core/embed/rust/Cargo.lock
+++ b/core/embed/rust/Cargo.lock
@@ -78,16 +78,6 @@ dependencies = [
  "libloading",
 ]
 
-[[package]]
-name = "cstr_core"
-version = "0.2.6"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "dd98742e4fdca832d40cab219dc2e3048de17d873248f83f17df47c1bea70956"
-dependencies = [
- "cty",
- "memchr",
-]
-
 [[package]]
 name = "cty"
 version = "0.2.2"
@@ -340,7 +330,6 @@ version = "0.1.0"
 dependencies = [
  "bindgen",
  "cc",
- "cstr_core",
  "cty",
  "easer",
  "glob",
diff --git a/core/embed/rust/Cargo.toml b/core/embed/rust/Cargo.toml
index 30573b1af8..eae620d814 100644
--- a/core/embed/rust/Cargo.toml
+++ b/core/embed/rust/Cargo.toml
@@ -112,11 +112,6 @@ features = ["libm"]
 [dependencies.num-derive]
 version = "0.3.3"
 
-[dependencies.cstr_core]
-version = "0.2.6"
-default-features = false
-features = ["nightly"]
-
 [dependencies.static-alloc]
 version = "0.2.4"
 
diff --git a/core/embed/rust/src/crypto/mod.rs b/core/embed/rust/src/crypto/mod.rs
index ecb5348f67..8e4c505d04 100644
--- a/core/embed/rust/src/crypto/mod.rs
+++ b/core/embed/rust/src/crypto/mod.rs
@@ -16,9 +16,9 @@ pub enum Error {
 impl From<Error> for crate::error::Error {
     fn from(e: Error) -> Self {
         match e {
-            Error::SignatureVerificationFailed => value_error!("Signature verification failed"),
-            Error::InvalidEncoding => value_error!("Invalid key or signature encoding"),
-            Error::InvalidParams => value_error!("Invalid cryptographic parameters"),
+            Error::SignatureVerificationFailed => value_error!(c"Signature verification failed"),
+            Error::InvalidEncoding => value_error!(c"Invalid key or signature encoding"),
+            Error::InvalidParams => value_error!(c"Invalid cryptographic parameters"),
         }
     }
 }
diff --git a/core/embed/rust/src/error.rs b/core/embed/rust/src/error.rs
index 4b2db7d02e..732e75ae61 100644
--- a/core/embed/rust/src/error.rs
+++ b/core/embed/rust/src/error.rs
@@ -1,5 +1,4 @@
-use core::{convert::Infallible, num::TryFromIntError};
-use cstr_core::CStr;
+use core::{convert::Infallible, ffi::CStr, num::TryFromIntError};
 
 #[cfg(feature = "micropython")]
 use {
@@ -30,7 +29,7 @@ pub enum Error {
 #[macro_export]
 macro_rules! value_error {
     ($msg:expr) => {
-        $crate::error::Error::ValueError(cstr_core::cstr!($msg))
+        $crate::error::Error::ValueError($msg)
     };
 }
 
diff --git a/core/embed/rust/src/micropython/obj.rs b/core/embed/rust/src/micropython/obj.rs
index dd0913223d..38e75d00b8 100644
--- a/core/embed/rust/src/micropython/obj.rs
+++ b/core/embed/rust/src/micropython/obj.rs
@@ -1,6 +1,7 @@
-use core::convert::{TryFrom, TryInto};
-
-use cstr_core::CStr;
+use core::{
+    convert::{TryFrom, TryInto},
+    ffi::CStr,
+};
 
 use crate::error::Error;
 
@@ -290,7 +291,7 @@ impl TryFrom<&'static CStr> for Obj {
         // SAFETY:
         //  - `CStr` is guaranteed to be null-terminated UTF-8.
         //  - the argument is static so it will remain valid for the lifetime of result.
-        let obj = unsafe { ffi::trezor_obj_str_from_rom_text(val.as_ptr()) };
+        let obj = unsafe { ffi::trezor_obj_str_from_rom_text(val.as_ptr() as _) };
         if obj.is_null() {
             Err(Error::AllocationFailed)
         } else {
diff --git a/core/embed/rust/src/micropython/util.rs b/core/embed/rust/src/micropython/util.rs
index a8f337cfeb..5ec0cb27dd 100644
--- a/core/embed/rust/src/micropython/util.rs
+++ b/core/embed/rust/src/micropython/util.rs
@@ -133,7 +133,7 @@ where
     let vec: Vec<T, N> = iter_into_vec(iterable)?;
     // Returns error if array.len() != N
     vec.into_array()
-        .map_err(|_| value_error!("Invalid iterable length"))
+        .map_err(|_| value_error!(c"Invalid iterable length"))
 }
 
 pub fn iter_into_vec<T, E, const N: usize>(iterable: Obj) -> Result<Vec<T, N>, Error>
@@ -144,7 +144,7 @@ where
     let mut vec = Vec::<T, N>::new();
     for item in IterBuf::new().try_iterate(iterable)? {
         vec.push(item.try_into()?)
-            .map_err(|_| value_error!("Invalid iterable length"))?;
+            .map_err(|_| value_error!(c"Invalid iterable length"))?;
     }
     Ok(vec)
 }
diff --git a/core/embed/rust/src/protobuf/error.rs b/core/embed/rust/src/protobuf/error.rs
index 90cf2ee380..e29975ec76 100644
--- a/core/embed/rust/src/protobuf/error.rs
+++ b/core/embed/rust/src/protobuf/error.rs
@@ -1,23 +1,21 @@
-use cstr_core::cstr;
-
 use crate::{error::Error, micropython::qstr::Qstr};
 
 pub const fn experimental_not_enabled() -> Error {
-    value_error!("Experimental features are disabled.")
+    value_error!(c"Experimental features are disabled.")
 }
 
 pub const fn unknown_field_type() -> Error {
-    value_error!("Unknown field type.")
+    value_error!(c"Unknown field type.")
 }
 
 pub fn missing_required_field(field: Qstr) -> Error {
-    Error::ValueErrorParam(cstr!("Missing required field."), field.into())
+    Error::ValueErrorParam(c"Missing required field.", field.into())
 }
 
 pub fn invalid_value(field: Qstr) -> Error {
-    Error::ValueErrorParam(cstr!("Invalid value for field."), field.into())
+    Error::ValueErrorParam(c"Invalid value for field.", field.into())
 }
 
 pub const fn end_of_buffer() -> Error {
-    value_error!("End of buffer.")
+    value_error!(c"End of buffer.")
 }
diff --git a/core/embed/rust/src/translations/blob.rs b/core/embed/rust/src/translations/blob.rs
index 3ba42610ba..8d734a8cbe 100644
--- a/core/embed/rust/src/translations/blob.rs
+++ b/core/embed/rust/src/translations/blob.rs
@@ -19,7 +19,7 @@ const SIGNATURE_THRESHOLD: u8 = 2;
 // should be max 1.
 const MAX_TABLE_PADDING: usize = 3;
 
-const INVALID_TRANSLATIONS_BLOB: Error = value_error!("Invalid translations blob");
+const INVALID_TRANSLATIONS_BLOB: Error = value_error!(c"Invalid translations blob");
 
 #[repr(packed)]
 struct OffsetEntry {
@@ -145,7 +145,7 @@ impl<'a> Translations<'a> {
         let remaining = blob_reader.rest();
         if !remaining.iter().all(|&b| b == EMPTY_BYTE) {
             // TODO optimize to quadwords?
-            return Err(value_error!("Trailing data in translations blob"));
+            return Err(value_error!(c"Trailing data in translations blob"));
         }
 
         let payload_bytes = payload_reader.rest();
@@ -337,7 +337,7 @@ impl<'a> TranslationsHeader<'a> {
 
         let model = read_fixedsize_str(&mut header_reader, 4)?;
         if model != crate::trezorhal::model::INTERNAL_NAME {
-            return Err(value_error!("Wrong Trezor model"));
+            return Err(value_error!(c"Wrong Trezor model"));
         }
 
         let version_bytes = header_reader.read(4)?;
diff --git a/core/embed/rust/src/translations/flash.rs b/core/embed/rust/src/translations/flash.rs
index 3a7387ad1a..a99b045de8 100644
--- a/core/embed/rust/src/translations/flash.rs
+++ b/core/embed/rust/src/translations/flash.rs
@@ -15,7 +15,7 @@ pub fn erase() -> Result<(), Error> {
     let blob = unwrap!(TRANSLATIONS_ON_FLASH.try_write());
     {
         if blob.is_some() {
-            return Err(value_error!("Translations blob already set"));
+            return Err(value_error!(c"Translations blob already set"));
         }
 
         // SAFETY: The blob is not set, so there are no references to it.
@@ -33,7 +33,7 @@ pub fn write(data: &[u8], offset: usize) -> Result<(), Error> {
     let blob = unwrap!(TRANSLATIONS_ON_FLASH.try_write());
     let result = {
         if blob.is_some() {
-            return Err(value_error!("Translations blob already set"));
+            return Err(value_error!(c"Translations blob already set"));
         }
 
         // SAFETY: The blob is not set, so there are no references to it.
@@ -42,7 +42,7 @@ pub fn write(data: &[u8], offset: usize) -> Result<(), Error> {
     if result {
         Ok(())
     } else {
-        Err(value_error!("Failed to write translations blob"))
+        Err(value_error!(c"Failed to write translations blob"))
     }
 }
 
@@ -92,7 +92,7 @@ pub fn init() {
 /// If the blob is locked by a reader, `deinit()` will return an error.
 pub fn deinit() -> Result<(), Error> {
     let Some(mut blob) = TRANSLATIONS_ON_FLASH.try_write() else {
-        return Err(value_error!("Translations are in use."));
+        return Err(value_error!(c"Translations are in use."));
     };
     *blob = None;
     Ok(())
@@ -116,5 +116,5 @@ pub fn deinit() -> Result<(), Error> {
 pub fn get() -> Result<RwLockReadGuard<'static, Option<Translations<'static>>>, Error> {
     TRANSLATIONS_ON_FLASH
         .try_read()
-        .ok_or_else(|| value_error!("Translations are in use."))
+        .ok_or(value_error!(c"Translations are in use."))
 }
diff --git a/core/embed/rust/src/trezorhal/slip39.rs b/core/embed/rust/src/trezorhal/slip39.rs
index 6d061c8856..cc7e568680 100644
--- a/core/embed/rust/src/trezorhal/slip39.rs
+++ b/core/embed/rust/src/trezorhal/slip39.rs
@@ -1,5 +1,4 @@
-use core::str;
-use cstr_core::CStr;
+use core::{ffi::CStr, str};
 
 use super::ffi;
 
@@ -26,6 +25,6 @@ pub fn button_sequence_to_word(prefix: u16) -> Option<&'static str> {
     } else {
         // SAFETY: On success, `button_sequence_to_word` should return a 0-terminated
         // UTF-8 string with static lifetime.
-        Some(unsafe { str::from_utf8_unchecked(CStr::from_ptr(word).to_bytes()) })
+        Some(unsafe { str::from_utf8_unchecked(CStr::from_ptr(word as _).to_bytes()) })
     }
 }
diff --git a/core/embed/rust/src/trezorhal/storage.rs b/core/embed/rust/src/trezorhal/storage.rs
index 3013a009d4..46fa04e573 100644
--- a/core/embed/rust/src/trezorhal/storage.rs
+++ b/core/embed/rust/src/trezorhal/storage.rs
@@ -80,12 +80,12 @@ pub enum StorageError {
 impl From<StorageError> for Error {
     fn from(err: StorageError) -> Self {
         match err {
-            StorageError::InvalidData => value_error!("Invalid data for storage"),
-            StorageError::WriteFailed => value_error!("Storage write failed"),
-            StorageError::ReadFailed => value_error!("Storage read failed"),
-            StorageError::DeleteFailed => value_error!("Storage delete failed"),
+            StorageError::InvalidData => value_error!(c"Invalid data for storage"),
+            StorageError::WriteFailed => value_error!(c"Storage write failed"),
+            StorageError::ReadFailed => value_error!(c"Storage read failed"),
+            StorageError::DeleteFailed => value_error!(c"Storage delete failed"),
             StorageError::CounterFailed => {
-                value_error!("Retrieving counter value failed")
+                value_error!(c"Retrieving counter value failed")
             }
         }
     }
diff --git a/core/embed/rust/src/trezorhal/wordlist.rs b/core/embed/rust/src/trezorhal/wordlist.rs
index ecfd497e5c..a68a4b5670 100644
--- a/core/embed/rust/src/trezorhal/wordlist.rs
+++ b/core/embed/rust/src/trezorhal/wordlist.rs
@@ -1,6 +1,5 @@
 use super::ffi;
-use core::cmp::Ordering;
-use cstr_core::CStr;
+use core::{cmp::Ordering, ffi::CStr};
 
 /// Holds all the possible words with the possibility to interact
 /// with the "list" - filtering it further, getting their count, etc.
@@ -102,7 +101,7 @@ unsafe fn from_utf8_unchecked<'a>(word: *const cty::c_char) -> &'a str {
     // SAFETY: caller must pass a valid 0-terminated UTF-8 string.
     // This assumption holds for usage on words of the BIP-39/SLIP-39 wordlists.
     unsafe {
-        let word = CStr::from_ptr(word);
+        let word = CStr::from_ptr(word as _);
         core::str::from_utf8_unchecked(word.to_bytes())
     }
 }
diff --git a/core/embed/rust/src/ui/display/toif.rs b/core/embed/rust/src/ui/display/toif.rs
index bdcf9f6b61..657f7d5b43 100644
--- a/core/embed/rust/src/ui/display/toif.rs
+++ b/core/embed/rust/src/ui/display/toif.rs
@@ -208,11 +208,11 @@ impl<'i> Toif<'i> {
     pub const fn new(data: &'i [u8]) -> Result<Self, Error> {
         if data.len() < TOIF_HEADER_LENGTH || data[0] != b'T' || data[1] != b'O' || data[2] != b'I'
         {
-            return Err(value_error!("Invalid TOIF header."));
+            return Err(value_error!(c"Invalid TOIF header."));
         }
         let zdatalen = u32::from_le_bytes([data[8], data[9], data[10], data[11]]) as usize;
         if zdatalen + TOIF_HEADER_LENGTH != data.len() {
-            return Err(value_error!("Invalid TOIF length."));
+            return Err(value_error!(c"Invalid TOIF length."));
         }
         Ok(Self {
             data,
diff --git a/core/embed/rust/src/ui/model_mercury/layout.rs b/core/embed/rust/src/ui/model_mercury/layout.rs
index ad12ca0517..0d349a6a5d 100644
--- a/core/embed/rust/src/ui/model_mercury/layout.rs
+++ b/core/embed/rust/src/ui/model_mercury/layout.rs
@@ -526,7 +526,7 @@ extern "C" fn new_confirm_homescreen(n_args: usize, args: *const Obj, kwargs: *m
             ))
         } else {
             if !check_homescreen_format(jpeg) {
-                return Err(value_error!("Invalid image."));
+                return Err(value_error!(c"Invalid image."));
             };
 
             LayoutObj::new(SwipeUpScreen::new(
diff --git a/core/embed/rust/src/ui/model_tt/layout.rs b/core/embed/rust/src/ui/model_tt/layout.rs
index 538cc91b97..2076ff527a 100644
--- a/core/embed/rust/src/ui/model_tt/layout.rs
+++ b/core/embed/rust/src/ui/model_tt/layout.rs
@@ -602,7 +602,7 @@ extern "C" fn new_confirm_homescreen(n_args: usize, args: *const Obj, kwargs: *m
         }
 
         if !check_homescreen_format(jpeg, false) {
-            return Err(value_error!("Invalid image."));
+            return Err(value_error!(c"Invalid image."));
         };
 
         let buttons = Button::cancel_confirm_text(None, Some(TR::buttons__change.into()));
diff --git a/core/embed/rust/src/ui/util.rs b/core/embed/rust/src/ui/util.rs
index 6f5ede8a72..1beec7798e 100644
--- a/core/embed/rust/src/ui/util.rs
+++ b/core/embed/rust/src/ui/util.rs
@@ -9,7 +9,6 @@ use crate::{
     },
 };
 
-use cstr_core::CStr;
 use heapless::String;
 
 use super::display::Font;
@@ -40,7 +39,7 @@ pub unsafe fn from_c_str<'a>(c_str: *const cty::c_char) -> Option<&'a str> {
         return None;
     }
     unsafe {
-        let bytes = CStr::from_ptr(c_str).to_bytes();
+        let bytes = core::ffi::CStr::from_ptr(c_str as _).to_bytes();
         if bytes.is_ascii() {
             Some(core::str::from_utf8_unchecked(bytes))
         } else {