maybe the target device "debug" fuse be set wrong . Thanks for your sch of using 876a as a icd2. You disassemble icd2 hex file, and reassemble it using 876a?
Warn 0015. Program memory has changed since last program operation?
Continue with debug operations?
OK
Reset
ICD0083 Target not in debug mode enable to perf. oper.
ICD0069 Unable to run target
Help to understand this?