diff --git a/core/embed/trezorhal/stm32f4/monoctr.c b/core/embed/trezorhal/stm32f4/monoctr.c
index 031b311f4..fb8e1c5b7 100644
--- a/core/embed/trezorhal/stm32f4/monoctr.c
+++ b/core/embed/trezorhal/stm32f4/monoctr.c
@@ -25,6 +25,12 @@
 
 #ifdef KERNEL_MODE
 
+#if !PRODUCTION
+// we don't want to override OTP on development boards
+// lets mock this functionality
+static uint8_t dummy_version = 0;
+#endif
+
 #if PRODUCTION
 static int get_otp_block(monoctr_type_t type) {
   switch (type) {
@@ -76,6 +82,10 @@ secbool monoctr_write(monoctr_type_t type, uint8_t value) {
   mpu_mode_t mpu_mode = mpu_reconfig(MPU_MODE_OTP);
   ensure(flash_otp_write(block, 0, bits, FLASH_OTP_BLOCK_SIZE), NULL);
   mpu_restore(mpu_mode);
+#else
+  if (value >= dummy_version) {
+    dummy_version = value;
+  }
 #endif
   return sectrue;
 }