I've got my good old 9505 I bought right at release on which the Volume UP button (or more likely whatever hardware it's connected to, as the button itself works perfectly normally) has become stuck pressed.
That causes a little problem - I can't enter Download mode anymore (Normal power up enters recovery due to the stuck key, Vol Down cancels Recovery and boots normally).
I had a custom ROM and recovery on it, and in order to send it for repair I obviously want to put it back to stock status, so I have reflashed a stock MI8 image I found using ODIN, using the custom recovery's "Reboot in Download mode" command.
Now the problem is I have bad luck and likely had an incompatible modem, and after booting even with cache/data wiped I have the Samsung keyboard crashing constantly and WiFi won't work.
Of course restoring the stock image wiped my custom recovery, so I can't use the same trick to get back into Download mode and reflash another modem.
I can't use Mobile ODIN or reboot menus with a "Reboot Download" option, as those requires root, but... rooting needs Download mode.
I can connect to Kies, but for my region it unfortunately says the current ROM is already the latest.
Does someone have an idea I didn't think about?