I have had my phone (Samsung Galaxy S4 GT-I9505, Android 4.4.2) rooted for a while (can't remember exactly how I did it now) but last night I exhausted the battery and when I charged and powered back on I had lost root. SuperSU quits with error message "There is no SU binary installed and SuperSU cannot install it. This is a problem!"
I have tried to re-root following these instructions but when I do the Volume Up + Centre Home + Power combination I don't get the warning message about installing custom OS, instead I get:
Android system recovery <3e>
Volume up/down to move highlight; power button to select.
- reboot system now
- apply update from ADB
- apply update from external storage
- wipe data/factory reset
- wipe cache partition
- apply update from cache
[Exposed Android with red warning triangle]
# MANUAL MODE #
-- Applying Multi-CSC --
Applied the CSC-code : BTU
Successfully applied multi-CSC
Now from here I don't seem to be able to flash TWRP because nothing shows up in Odin when USB is connected. If I select "reboot system now" I get back into un-rooted Android (annoying because I make extensive use of multiple profiles on Titanium Backup); if I select apply update from ADB then the S4 then appears as a device when I run
List of devices attached 6496ea42 sideload
But still nothing on Odin.
Can anyone advise how I can re-flash TWRP and re-root?