Even though this is my very first post here, I've been occupied with rooting android phones and flashing new ROMs quite often. I encountered what seems to be an unsolvable problem.
I'm using an S3 I9300 with ArchiDroid v3.1.5 flashed. I had to remove the power button several months ago due to malfunctioning. A couple days ago, my phone suddenly went into a boot loop after the battery was drained and phone was shut down. I charged the phone and turned it on but it never boots. Samsung logo comes and archidroid boot animation starts but the phone gets stuck there. I actually know many ways to get out of a boot loop using download mode, recovery mode, adb, fastboot etc. However, it seems like there's no way to get my phone out of this loop since it does not have a power button. I've tried every single method to go into recovery or download mode without a power button but it does not work. Since the phone does not boot, I can't use any apps to go into download or recovery mode. I tried using adb while the phone is stuck at boot animation but it is a no go due to authorization. It looks like there is no way to get this phone into either download or recovery mode where I can save it easily.
I've been searching everywhere for the last two days for a solution and any method I found, I tried immediately but nothing works. I tried all common and even uncommon methods to put the phone into download mode without a power button. Also couldn't find a way to get around the authorization problem to use adb.
My phone is now out of order and I need a solution urgently. Any help will be appreciated. Thanks in advance.