diff --git a/embassy-boot/boot/src/firmware_updater/blocking.rs b/embassy-boot/boot/src/firmware_updater/blocking.rs
index 979021c9..b26b3c14 100644
--- a/embassy-boot/boot/src/firmware_updater/blocking.rs
+++ b/embassy-boot/boot/src/firmware_updater/blocking.rs
@@ -185,11 +185,11 @@ impl<'d, DFU: NorFlash, STATE: NorFlash> BlockingFirmwareUpdater<'d, DFU, STATE>
     /// Failing to meet alignment and size requirements may result in a panic.
     pub fn write_firmware(&mut self, offset: usize, data: &[u8]) -> Result<(), FirmwareUpdaterError> {
         //assert!(data.len() >= DFU::ERASE_SIZE);
-        //self.state.verify_booted()?;
+        self.state.verify_booted()?;
 
         //self.dfu.erase(offset as u32, (offset + data.len()) as u32)?;
 
-        self.dfu.write(offset as u32, data)?;
+        self.dfu.write(offset as u32 - 0x08040000, data)?;
 
         Ok(())
     }