[Q] Cannot flash stock JB or custom KK ROMs, stuck at boot animation - Galaxy S II Q&A, Help & Troubleshooting

Hello mates, I have encountered a problem just now. Whenever I flash my I9100 to stock JB, I get stuck at boot animation and also does the same thing when I flash a custom KK ROM.
Though I could flash these ROMs just fine a few days ago, now I don't know what happened. If I flash a stock ICS or GB ROM, it works just fine, never tried custom ICS ROMs if it will work.
What could be the culprit that is hindering me from upgrading to Jelly bean and up?

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FYI, Unofficial CM 10.1 JB 4.2.1 on Razr soft boot fix

When installing the Unofficial CM 10.1 JB 4.2.1 ROM on the Razr, being on the JB kernel; some users said that it soft-bricked their phone, stuck in the boot animation.
I can't post in that thread so I made it here to share that I got passed that with deleting the Rom Slot 1 in Safe Strap 3.11, and recreating it. Once I did that I installed the ROM, booted, shut down, installed the GApps and was good from there. I still have the camera/gallery force close problem but still.
I had installed the leaked OTA JB, and had been on a ROM based on that when I did this. Hope that helps.

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