diff --git a/core/SConscript.firmware b/core/SConscript.firmware
index fa6d02157d..ebdeb4fbb6 100644
--- a/core/SConscript.firmware
+++ b/core/SConscript.firmware
@@ -197,6 +197,7 @@ SOURCE_MOD += [
     'embed/lib/image.c',
     'embed/lib/mini_printf.c',
     'embed/lib/terminal.c',
+    'embed/lib/translations.c',
     'embed/lib/unit_variant.c',
     'vendor/micropython/lib/uzlib/adler32.c',
     'vendor/micropython/lib/uzlib/crc32.c',
diff --git a/core/SConscript.unix b/core/SConscript.unix
index 3a93dbc744..f3d20cd66a 100644
--- a/core/SConscript.unix
+++ b/core/SConscript.unix
@@ -197,6 +197,7 @@ SOURCE_MOD += [
     'embed/lib/fonts/fonts.c',
     'embed/lib/image.c',
     'embed/lib/terminal.c',
+    'embed/lib/translations.c',
     'embed/lib/unit_variant.c',
     'vendor/micropython/lib/uzlib/adler32.c',
     'vendor/micropython/lib/uzlib/crc32.c',
@@ -375,7 +376,6 @@ SOURCE_MICROPYTHON = [
 
 SOURCE_UNIX = [
     'embed/trezorhal/unix/boot_args.c',
-    'embed/trezorhal/unix/translations.c',
     'embed/trezorhal/unix/common.c',
     'embed/trezorhal/unix/display-unix.c',
     'embed/trezorhal/unix/flash.c',
diff --git a/core/embed/trezorhal/stm32f4/translations.c b/core/embed/lib/translations.c
similarity index 61%
rename from core/embed/trezorhal/stm32f4/translations.c
rename to core/embed/lib/translations.c
index d01debbf4b..108b318a62 100644
--- a/core/embed/trezorhal/stm32f4/translations.c
+++ b/core/embed/lib/translations.c
@@ -13,11 +13,24 @@ bool translations_write(const uint8_t* data, uint32_t offset, uint32_t len) {
   }
 
   ensure(flash_unlock_write(), "translations_write unlock");
-  for (int i = 0; i < len; i++) {
-    // TODO optimize by writing by (quad)words
-    ensure(flash_area_write_byte(&TRANSLATIONS_AREA, offset + i, data[i]),
+  for (int i = 0; i < (len / FLASH_BLOCK_SIZE); i++) {
+    // todo consider alignment
+    ensure(flash_area_write_block(&TRANSLATIONS_AREA,
+                                  offset + (i * FLASH_BLOCK_SIZE),
+                                  (const uint32_t*)&data[i * FLASH_BLOCK_SIZE]),
            "translations_write write");
   }
+
+  if (len % FLASH_BLOCK_SIZE) {
+    flash_block_t block = {0};
+    memset(block, 0xFF, FLASH_BLOCK_SIZE);
+    memcpy(block, data + (len / FLASH_BLOCK_SIZE) * FLASH_BLOCK_SIZE,
+           len % FLASH_BLOCK_SIZE);
+    ensure(flash_area_write_block(
+               &TRANSLATIONS_AREA,
+               offset + (len / FLASH_BLOCK_SIZE) * FLASH_BLOCK_SIZE, block),
+           "translations_write write rest");
+  }
   ensure(flash_lock_write(), "translations_write lock");
   return true;
 }
diff --git a/core/embed/trezorhal/translations.h b/core/embed/lib/translations.h
similarity index 100%
rename from core/embed/trezorhal/translations.h
rename to core/embed/lib/translations.h
diff --git a/core/embed/trezorhal/unix/translations.c b/core/embed/trezorhal/unix/translations.c
deleted file mode 120000
index 21b03004c7..0000000000
--- a/core/embed/trezorhal/unix/translations.c
+++ /dev/null
@@ -1 +0,0 @@
-../stm32f4/translations.c
\ No newline at end of file
diff --git a/core/site_scons/boards/stm32f4_common.py b/core/site_scons/boards/stm32f4_common.py
index fff6d27962..c9d83588cf 100644
--- a/core/site_scons/boards/stm32f4_common.py
+++ b/core/site_scons/boards/stm32f4_common.py
@@ -53,7 +53,6 @@ def stm32f4_common_files(env, defines, sources, paths):
         "embed/trezorhal/stm32f4/random_delays.c",
         "embed/trezorhal/stm32f4/rng.c",
         "embed/trezorhal/stm32f4/vectortable.s",
-        "embed/trezorhal/stm32f4/translations.c",
     ]
 
     # boardloader needs separate assembler for some function unencumbered by various FW+bootloader hacks