Hello, I've been trying to program an Atmega 1281 on a custom circuit board. I've been using an Uno with Arduino ISP firmware installed, but have hit a bit of a snag. When I try to bootload the 1281 I get random invalid device signatures. Such as 0x070000, 0xff0000, and 0x80001e; see the verbose o…

Uno as ISP for Atmega 1281

Topic		Replies	Views
Device Signature Becomes 0x000000 After Programming Microcontroller Uploading	6	2001	May 6, 2021
Arduino Bootloading Issues 3rd Party Boards	7	2565	May 6, 2021
Arduino as ISP: Device signature = 0x000000 Networking, Protocols, and Devices	11	9667	May 6, 2021
ArduinoISP Arduino uno & blank atmega8 bootloader burn trouble 3rd Party Boards	65	30901	May 6, 2021
avrdude: Yikes! Invalid device signature. Deutsch	12	12447	May 6, 2021