when using flashcat, i use the usual layout for the pins and for the isp point i use pin2 with 3.3v. this works with flashcat on sb6120, sb6121, and sb6141 around 90% of the time. some chips are stubborn and won't detect.
for those i disconnect flashcat, change to pin1 with 3.3v and reconnect. if it still doesn't detect, i disconnect and flip to 5v then reconnect on pin1, repeat for pin2 with 5v, eventually i detect and write to it. sometimes i need to remove the soic clip from the chip and reset it
this has worked for all modems i've programmed except one sb6141 that was undetectable. always disconnect flashcat before changing the volts. i burned out a flashcat by changing volts while it's connected
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