Remove redundant check, debug assert on ob unlock

README.md

@@ -1,6 +1,6 @@
 # TinyUF2 flash unlocker for STM32F411 (easily adaptable to other STM32F4xx)
 
-This small program is meant to unlock the first 4 (=64kb) flash sectors that are occupied by the TinyUF2 bootloader, if they have been locked by it. After the unlock procedure it jumps to the built-in DFU bootloader of the STM32F4 MCUs. This is useful for e.g. self-updating the TinyUF2 bootloader or replacing it with something else.
+This small program is meant to unlock the first 2 (=32kb) flash sectors that are occupied by the TinyUF2 bootloader, if they have been locked by it. After the unlock procedure it jumps to the built-in DFU bootloader of the STM32F4 MCUs. This is useful for e.g. self-updating the TinyUF2 bootloader or replacing it with something else.
 
 ## Usage
 

src/main.rs

@@ -23,12 +23,12 @@ fn main() -> ! {
         let optkeyr = &flash.optkeyr;
 
         // Unprotect flash sectors if it is necessary
-        if (optcr.read().n_wrp().bits() & FLASH_SECTORS_MASK) != FLASH_SECTORS_MASK {
+        if optcr.read().n_wrp().bits() != FLASH_SECTORS_MASK {
             // Unlock option bytes
             if optcr.read().optlock().bit_is_set() {
                 optkeyr.write(|w| w.optkey().bits(FLASH_OPT_KEY1));
                 optkeyr.write(|w| w.optkey().bits(FLASH_OPT_KEY2));
-                assert!(optcr.read().optlock().bit_is_clear());
+                debug_assert!(optcr.read().optlock().bit_is_clear());
             }
 
             // Wait for any flash operations to complete