14-11-2015, 02:18 PM
Yep, easiest way for a 6120 is with the ISP line, hook it up before powering on the modem and don't let it drop. Solder it in place or get a helper to hold it there nice and steady. If you don't have a setup with an ISP line, you can apply 3.3v to pin 2 on the SPI flash (and properly ground it, pin 10 I think?) and in that case, do NOT power the modem on. Either way should work fine, I've done both with a usbjtagnt, I can't imagine it'd be significantly different for a flashcat/bcjtag.