Hello, Your reply did not reach the mailing list. Please use "Reply to all" so that your messages can reach more people than just me. On Tue, Mar 12, 2019, 09:06 Frei Bjerkestrand <frei.bjerkestrand@hotmail.no wrote:

No I'm pretty sure the 1.8V is connected. Should I try to disassemble the programmer and the 1.8V converter and assemble it again?

So you are using a 1.8V converter between the programmer and the chip? Regarding the original issue: If you can not change any bytes, I would suspect the flash chip is write-protected. Check its datasheet, it is likely pin 3 is somehow pulled low (write-protect pin is usually active when low). Regards, Angel Pons