my phone went dead recently during an update attempt and I just left the battery out for a month. When I tried it again (last night) to my happy surprise it booted up/ Your mileage may vary, but I hope you have good fortune like I did.
After some tests, I found this. If you have your phone connected to a PC (windows) to transfer files to the phone's externalSD directory, then use the "remove hardware option" without noticing there are TWO hardwares listed, then turn off USB from...
Already mentioned in this thread, there is an index on first post, give it a look to see what else you missed.
I don't understand using an app for this. Just make a shortcu...
and anything else you can find.