Thanks! However, I need a way to get the zip onto the phone. Right now I can only boot to recovery, and while in recovery the PC doesn't recognize the phone, so I can't transfer the file onto the phone. Is there any way around this?
[update] Solved. I downloaded and install the minimal adb and fastboot to the PC, boot to fastboot (power down, hold vol- and power til power up, then choose fastboot), connect to PC, then type "fastboot flash recovery name_of_twrp_recovery.img", then "fastboot reboot". Voila, got TWRP 2.7. Flash the viperDNA 4.1.0 that's already in the phone and success!