So which parts is 2 yrs ?
Lenovo Msia said yes... end of June
This hp will say bye2 to 4x in 1 blink eyes...
Yup
Nope... based on hardware... if sim2 is 2G, no way u can get 3G/4G by upgrading rom
1) install 1518_ST, then ur 4G will improve
2) Yes
3) Contact got prob, unable to read number with country code. So need to clear data for whatsapp & re-login.
4) No... Need to flash via CWM
5) Yes & PlayStore also gone after update. Need to flash back via CWM. Sap sap suiii jeee...

I've prepared the step on how to flash this hp.
Depends... 3-4 hours...
No Lenovo warranty card in the box...
AP set = sim1 4g , sim2 2G
ORI set = sim1 4g , sim2 4G