Hello! (sorry my english is not so good)
If someone have problem with 3g, I was found solution...works for me...In all ROM my data falls down, only thing was remove battery and placed together. I was tested a lot of ROm and other things...
For now is best solution:
-last Rom from Jiayu.es
-Baseband_ZP990_G4T_fix_MTU_by_intelinside_rev2_zip (mybe this not need)
-superkernel by Fraggel
(but touch screen is not 100% accurate, but for now only this works good)
-modem_v7.F2.P2.27.12.2013_ZP990.zip
If you have any questions...just ask!
BES