There is one other approach that MAY help using flasher-3.5. And in particular, having ssh access is a BIG help. I advise anyone doing anything edgy with this phone to do so.

Get phone connected and into usb mode. Test (as root if need be):
Next, put phone in R&D mode
Then disable lifeguard
Reboot phone and unplug usb
Now, with lifeguard suppressed you just may get onto your phone although there may be instability, as lifeguard does what it does for reasons. Nonetheless, you might be able to enable networking and the ssh server (if not already enabled by default). Using "top" may help identify what is screwing around, but more usefully you may be able to reverse whatever you did to cause the bloopsie.

Equally useful, is using ssh and recovering desired files via "scp" or "sftp" (google)

Has helped me in the past and again today.

You may also want to try to suppress the watchdog daemons --set-rd-flags=no-omap-wd, --set-rd-flags=no-ext-wd...

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