diff --git a/embed/boardloader/main.c b/embed/boardloader/main.c
index f6980e520a..e6cbe90494 100644
--- a/embed/boardloader/main.c
+++ b/embed/boardloader/main.c
@@ -182,8 +182,11 @@ int main(void)
         load_image_header((const uint8_t *)BOOTLOADER_START, BOOTLOADER_IMAGE_MAGIC, BOOTLOADER_IMAGE_MAXSIZE, BOARDLOADER_KEY_M, BOARDLOADER_KEY_N, BOARDLOADER_KEYS, &hdr),
         "invalid bootloader header");
 
+    uint8_t sectors[] = {
+        FLASH_SECTOR_BOOTLOADER,
+    };
     ensure(
-        check_image_contents(&hdr, (const uint8_t *)BOOTLOADER_START, IMAGE_HEADER_SIZE, 1),
+        check_image_contents(&hdr, IMAGE_HEADER_SIZE, sectors, 1),
         "invalid bootloader hash");
 
     jump_to(BOOTLOADER_START + IMAGE_HEADER_SIZE);
diff --git a/embed/bootloader/main.c b/embed/bootloader/main.c
index b316a182d6..95741e1d16 100644
--- a/embed/bootloader/main.c
+++ b/embed/bootloader/main.c
@@ -327,8 +327,23 @@ int main(void)
         load_image_header((const uint8_t *)(FIRMWARE_START + vhdr.hdrlen), FIRMWARE_IMAGE_MAGIC, FIRMWARE_IMAGE_MAXSIZE, vhdr.vsig_m, vhdr.vsig_n, vhdr.vpub, &hdr),
         "invalid firmware header");
 
+    uint8_t sectors[] = {
+        FLASH_SECTOR_FIRMWARE_START,
+        7,
+        8,
+        9,
+        10,
+        FLASH_SECTOR_FIRMWARE_END,
+        FLASH_SECTOR_FIRMWARE_EXTRA_START,
+        18,
+        19,
+        20,
+        21,
+        22,
+        FLASH_SECTOR_FIRMWARE_EXTRA_END,
+    };
     ensure(
-        check_image_contents(&hdr, (const uint8_t *)FIRMWARE_START, IMAGE_HEADER_SIZE + vhdr.hdrlen, 6),
+        check_image_contents(&hdr, IMAGE_HEADER_SIZE + vhdr.hdrlen, sectors, 13),
         "invalid firmware hash");
 
     display_vendor(vhdr.vimg, (const char *)vhdr.vstr, vhdr.vstr_len, hdr.version);
diff --git a/embed/trezorhal/flash.c b/embed/trezorhal/flash.c
index 8316a1ca9c..d59ce77d2d 100644
--- a/embed/trezorhal/flash.c
+++ b/embed/trezorhal/flash.c
@@ -5,9 +5,7 @@
 
 // see docs/memory.md for more information
 
-#define SECTOR_COUNT 24
-
-static const uint32_t SECTOR_TABLE[SECTOR_COUNT + 1] = {
+const uint32_t FLASH_SECTOR_TABLE[FLASH_SECTOR_COUNT + 1] = {
     [ 0] = 0x08000000, // - 0x08003FFF |  16 KiB
     [ 1] = 0x08004000, // - 0x08007FFF |  16 KiB
     [ 2] = 0x08008000, // - 0x0800BFFF |  16 KiB
@@ -68,7 +66,7 @@ bool flash_erase_sectors(const uint8_t *sectors, int len, void (*progress)(int p
             return false;
         }
         // check whether the sector was really deleted (contains only 0xFF)
-        uint32_t addr_start = SECTOR_TABLE[sectors[i]], addr_end = SECTOR_TABLE[sectors[i] + 1];
+        uint32_t addr_start = FLASH_SECTOR_TABLE[sectors[i]], addr_end = FLASH_SECTOR_TABLE[sectors[i] + 1];
         for (uint32_t addr = addr_start; addr < addr_end; addr += 4) {
             if (*((const uint32_t *)addr) != 0xFFFFFFFF) {
                 return false;
diff --git a/embed/trezorhal/flash.h b/embed/trezorhal/flash.h
index 14a5b93460..6b97bef0b8 100644
--- a/embed/trezorhal/flash.h
+++ b/embed/trezorhal/flash.h
@@ -38,6 +38,10 @@
 //                                          22
 #define FLASH_SECTOR_FIRMWARE_EXTRA_END     23
 
+#define FLASH_SECTOR_COUNT 24
+
+extern const uint32_t FLASH_SECTOR_TABLE[FLASH_SECTOR_COUNT + 1];
+
 void flash_set_option_bytes(void);
 
 bool flash_unlock(void);
diff --git a/embed/trezorhal/image.c b/embed/trezorhal/image.c
index 04201908ce..7e310ab121 100644
--- a/embed/trezorhal/image.c
+++ b/embed/trezorhal/image.c
@@ -4,6 +4,7 @@
 #include "ed25519-donna/ed25519.h"
 
 #include "common.h"
+#include "flash.h"
 #include "image.h"
 
 static bool compute_pubkey(uint8_t sig_m, uint8_t sig_n, const uint8_t * const *pub, uint8_t sigmask, ed25519_public_key res)
@@ -138,19 +139,24 @@ static bool check_hash(const uint8_t * const hash, const uint8_t * const data, i
 
 #define MIN(a,b) ((a) < (b) ? (a) : (b))
 
-bool check_image_contents(const image_header * const hdr, const uint8_t * const data, uint32_t firstskip, int maxblocks)
+bool check_image_contents(const image_header * const hdr, uint32_t firstskip, const uint8_t *sectors, int blocks)
 {
+    if (!sectors || blocks < 1) {
+        return false;
+    }
+    const void *data = (const void *)(FLASH_SECTOR_TABLE[sectors[0]] + firstskip);
     int remaining = hdr->codelen;
-    if (!check_hash(hdr->hashes, data + firstskip, MIN(remaining, IMAGE_CHUNK_SIZE - firstskip))) {
+    if (!check_hash(hdr->hashes, data, MIN(remaining, IMAGE_CHUNK_SIZE - firstskip))) {
         return false;
     }
     int block = 1;
     remaining -= IMAGE_CHUNK_SIZE - firstskip;
     while (remaining > 0) {
-        if (block >= maxblocks) {
+        if (block >= blocks) {
             return false;
         }
-        if (!check_hash(hdr->hashes + block * 32, data + block * IMAGE_CHUNK_SIZE, MIN(remaining, IMAGE_CHUNK_SIZE))) {
+        data = (const void *)FLASH_SECTOR_TABLE[sectors[block]];
+        if (!check_hash(hdr->hashes + block * 32, data, MIN(remaining, IMAGE_CHUNK_SIZE))) {
             return false;
         }
         block++;
diff --git a/embed/trezorhal/image.h b/embed/trezorhal/image.h
index 3cd57f0937..ca9da002d9 100644
--- a/embed/trezorhal/image.h
+++ b/embed/trezorhal/image.h
@@ -48,6 +48,6 @@ bool load_image_header(const uint8_t * const data, const uint32_t magic, const u
 
 bool load_vendor_header(const uint8_t * const data, uint8_t key_m, uint8_t key_n, const uint8_t * const *keys, vendor_header * const vhdr);
 
-bool check_image_contents(const image_header * const hdr, const uint8_t * const data, uint32_t firstskip, int maxblocks);
+bool check_image_contents(const image_header * const hdr, uint32_t firstskip, const uint8_t *sectors, int blocks);
 
 #endif