Inconsistent results (aka failures) burning Repetier 92.9 firmware
Hi. I'm in the process of attempting to replace the manufacturer provided Repetier .91 (on a P802M type printer) with 92.9. I'm seeing inconsistent results (to say the least).
First, I used avrdude to read out the current firmware as a hex file protection copy. No problems there.
I obtained a Configuration.h that is purported to be correct for this unit and board (and appears correct on inspection) -- ran it through the Repetier Configurator, downloaded the result, compiled with latest Arduino and exported hex OK (both with and without bootloader versions).
I used avrdude to try write the new version (without bootloader). It appeared successful -- wrote and verified without errors. However, it doesn't boot -- the display just shows the two blank lines on the four line display that is typical at the start of the booting procedure.
I then tried to write back the original downloaded firmware (.91). The write went OK, but avrdude exited before verifying. However, the firmware appears intact and the unit is booting and (in quick tests) seems functional -- with the original .91 firmware again.
I tried uploading the new version once again, but this is when things got stranger. Avrdude goes through its write cycle, the verify cycle, and then complains of a verify error. This is now consistent, and I stopped for now.
So at this time, I'm apparently back with the original .91 firmware and momentarily stuck.
I've seen some discussions suggesting a bootloader issue relating to .92 and I do have the new 92.9 hex file with the bootloader -- but I'm reluctant to burn that one without really understanding what's going on since I don't want to brick the unit completely.
Any suggestions appreciated. Thanks very much!