So I am taking the CompTIA A+ certification courses and on one of the sections about radio firmware, they say after placing
Update.zip in the root of the SD card to boot into recovery then press Alt+S and let the update finish.
The only way I know how would be to use the up and down volume keys and choose Update from Sd Card then press power.
I could only find the following reference to using Alt+S, it is a guide from the XDA Developers website from 2009:
[GUIDE] Fastboot for Noobs
Things you need:
New SPL - Download
New Radio - Download
Your Current ROM - CyanogenMod 3.6
SD Card Reader
Rooted G1 Phone
Install Radio FIRST
Download the Radio Update
Rename it to update.zip
Remove your SD Card from your phone and place it in your SD Card Reader
Put the update.zip at the root of your SDcard (root = not in any folder)
Insert your sdcard back into the phone
Turn off your phone (Hold power and press Power Off)
Hold the Home button and then press the power button (Keep holding power)
You will now enter recovery
Open up your keyboard and press Alt-S
Let it finish the update
When done reboot by pressing Home and Back
You should be able to access your Home screen (If its stuck on the Google G1 screen dont panic, just remove your battery for now)
My question would be: HOW would I open the keyboard in recovery mode? I tried a keyboard connected via OTG cable and could get it to move up and down and select, but Alt+S did nothing.
Now full disclosure, I DID NOT have any
Update.zip on my SD card. I was assuming I would get an error. The only device I have available at this time is my Samsung Galaxy S20 and I can't find the right file for my firmware.
Is this process outdated? Does it require that phone be rooted with a custom recovery? Without more info, the first sentence of this post makes no sense. If anyone can shed a light on this would be great.