they're working fine for me. Yeah, I believe so. Kingoroot. I got a microsd card from walmart and put the recovery and I think I put the flashr apk on it if I remember correctly and flashed it through that on the rom that I had that was broken (the haptic feedback buttons weren't working and it was meant for the gsm model so it couldn't connect to mobile or wifi and it had a whole host of other issues but it was capable of installing apps on my sd card). Then I went into recovery and flashed the sph-l520 rom and everything's been good with it so far.