Description
Hello,
I bought this radio weeks ago from AliExpress.
It has the separate board with "Nano" on it. But selecting the lower baud rate does not work.
I used xLoader first, reading someone else's tutorial how to flash this, but it seems, as warned on this site, the USB power was not enougzh and it only "half" worked. There is somewhat working firmware on it. Is the ~ 2x loud click after the boot screen showed the verison and it transitions to the operational screen normal, or already hints at a problem?
I can receive some stuff... so something works.
But if I try to reflash or verify, now with the much nicer AVRDUDESS, I can, again, only flash with the higher baud rate (the lower gets my sync errors), but at the end it reads, and the verify always fails: device 0xff != input 0x0c at addr 0x7800. I did not activate the "disable flash erase" option.
I also tried the Arduino IDE as suggested - here choosing the old bootloader makes everything fail, and the new one makes uploading a sketch work.
Flashing again the v1.18.hex results in the same mismatch error quited above, and it's still clicking hard after the boot screen.
I downloaded the firmware on a 2nd computer and compared in HxD hex editor the one I flashed vs. the newly downloaded - they are identical.
So, if anything, my post can serve to show that there are now "nano" ones where "old bootloader" and lower baud rate are wrong,
- It would be great if someone could help me find out why I am getting the flash verification mismatch, though... Could they have used fake or damaged arduino in my specimen? (as in, damaged flash memory)
- An unrelated note / suggestion (not sure if I should open an own thread):
About the battery display: "Solder one resistor to the negative (ground) and the other directly to the positive of the lithium battery" -> that would slowly drain the battery when the radio is not being used. The unit does seem to have a hard off switch. Has someone found good contact points to perhaps rather solder the "hot" resistor to after the on/off switch, which I presume would be a better spot as it doesn't deplete the battery?