I'm running 2.9.1 on an APM 1 board and since updating my stock quad has not been the same. Thanks to Randy's help, we've determined that the new code doesn't play well with the older chipset. I'd like to reinstall v2.8.1 since I my quad behaved nicely with that code.
How do I do that? I've searched the boards but have been unsuccessful in finding instructions. I downloaded the firmware but getting it onto the board has been illusive. I see the "Pick previous firmware" link under the firmware page in MP but the names are cryptic. See pic.
Any help would be appreciated.