diff --git a/arm9/source/fs.c b/arm9/source/fs.c
index cf5f364..ea359e6 100644
--- a/arm9/source/fs.c
+++ b/arm9/source/fs.c
@@ -398,6 +398,16 @@ void findDumpFile(const char *folderPath, char *fileName)
 
 static u8 fileCopyBuffer[0x10000];
 
+static const u8 boot9Sha256[32] = {
+    0x2F, 0x88, 0x74, 0x4F, 0xEE, 0xD7, 0x17, 0x85, 0x63, 0x86, 0x40, 0x0A, 0x44, 0xBB, 0xA4, 0xB9,
+    0xCA, 0x62, 0xE7, 0x6A, 0x32, 0xC7, 0x15, 0xD4, 0xF3, 0x09, 0xC3, 0x99, 0xBF, 0x28, 0x16, 0x6F
+};
+
+static const u8 boot11Sha256[32] = {
+    0x74, 0xDA, 0xAC, 0xE1, 0xF8, 0x06, 0x7B, 0x66, 0xCC, 0x81, 0xFC, 0x30, 0x7A, 0x3F, 0xDB, 0x50,
+    0x9C, 0xBE, 0xDC, 0x32, 0xF9, 0x03, 0xAE, 0xBE, 0x90, 0x61, 0x44, 0xDE, 0xA7, 0xA0, 0x75, 0x12
+};
+
 static bool backupEssentialFiles(void)
 {
     size_t sz = sizeof(fileCopyBuffer);
@@ -430,6 +440,15 @@ static bool backupEssentialFiles(void)
             ok = ok && fileWrite(fileCopyBuffer, "backups/HWCAL_01_EEPROM.dat", 0x1000);
     }
 
+    // B9S bootrom backups
+    u32 hash[32/4];
+    sha(hash, (const void *)0x08080000, 0x10000, SHA_256_MODE);
+    if (memcmp(hash, boot9Sha256, 32) == 0 && getFileSize("backups/boot9.bin") != 0x10000)
+        ok = ok && fileWrite((const void *)0x08080000, "backups/boot9.bin", 0x10000);
+    sha(hash, (const void *)0x08090000, 0x10000, SHA_256_MODE);
+    if (memcmp(hash, boot11Sha256, 32) == 0 && getFileSize("backups/boot11.bin") != 0x10000)
+        ok = ok && fileWrite((const void *)0x08090000, "backups/boot11.bin", 0x10000);
+
     return ok;
 }