kitkat

Hi, Im a bit confused. Managed to source a new motherboard after my dads tablet just kept boot looping at ACER splash screen. All working well, now fully up-to-date at 4.2.2 JB (incliuding the pre-KK small update) - downloaded from the Acer support pages and manually installed. Tablet now...

So I got a Sony Xperia Tablet SGPT121US and an Android Dell Venue 8, and they all get the same problem: boot loop stuck on logo screen. I have tried to at least factory reset and wipe data on the Sony (which run Android 4.0) through the Recovery mode but to no avail, the same thing keep...