Need advise: Can't access Download and Recover mode (Galaxy S2)

[bluejackets]

My phone is currently stuck at the "Samsung Galaxy S II" logo when booted and it won't go past that. I can't get into recovery mode and download mode.

SuperSU had an update and I accidentally pressed "twrp/cwm" instead of "normal" which made my phone reboot and has been stuck at the Samsung logo at boot up since then.

How may I be able to rectify this problem? I'd appreciate your advise.

Btw, I'm using Siyah-v3.2.6.4.

 

[creepyncrawly]

You don't say, but do you have the SGH-I777 AT&T version of the S2?

You need to be able to access download mode, and then flash stock firmware, or stock plus root.

It is highly unusual for the phone to boot to the Samsung screen, but not be able to access download mode. Are you sure? Please describe in detail what method you are using to access download mode.