Help! soft brick while upgrading to update 3.0

i downloaded the official 3.0 recovery image from nvidia and commented out the bit to flash there recovery so i could keep twrp just like i have previously w/o issues. now im stuck and cant seem to access the bootloader by holding the power button, adb, or fastboot. what other options do i have? flashing from update.zip on sd card?

Code:

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./flash-all.sh
< waiting for any device >
target reported max download size of 67108864 bytes
sending 'staging' (3091 KB)...
OKAY [  0.091s]
writing 'staging'...
OKAY [  0.152s]
finished. total time: 0.243s
target reported max download size of 67108864 bytes
sending 'boot' (21772 KB)...
OKAY [  0.527s]
writing 'boot'...
OKAY [  1.024s]
finished. total time: 1.551s
rebooting...

finished. total time: 0.059s
< waiting for any device >
sending 'system' (1578475 KB)...
FAILED (command write failed (Protocol error))
finished. total time: 0.000s
target reported max download size of 67108864 bytes
erasing 'vendor'...
OKAY [  0.164s]
sending sparse 'vendor' (65498 KB)...
OKAY [  1.606s]
writing 'vendor'...
OKAY [  3.285s]
sending sparse 'vendor' (65472 KB)...
OKAY [  1.582s]
writing 'vendor'...
OKAY [  2.895s]
sending sparse 'vendor' (65532 KB)...
OKAY [  1.611s]
writing 'vendor'...
OKAY [  3.437s]
sending sparse 'vendor' (48152 KB)...
OKAY [  1.196s]
writing 'vendor'...
OKAY [  2.448s]
finished. total time: 18.223s
rebooting...

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if it didnt sent the reboot command i could have seen the error and hopefully fixed it. guess i gave nvidia too much credit for error detection in there script.

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