[Android Q&A, Help & Troubleshooting] jbartolo:
The short history:

Playing with an "official" ROM I bricked my phone. I was able to recover it, everything works properly except the telephony, I can't make phone calls :crying:.

The full story:

The behaviour of my phone is different depending on which slot I put my SIM card.

If I put my SIM on the first slot, when the phone reboots it doesn't ask for the PIN and doesn't recognise the card. But if I switch to plane mode and I reboot the phone, the phone then asks for the PIN number. If I introduce an incorrect one, it recognises that it is incorrect ans ask for a new one (then it is reading the card to know that), but when I introduce the correct one, it does no connect whit my carrier (of course, before that I switch off the plane mode).

If I put my SIM on the second slot, it asks for the PIN number but similarly to the previous case, It doesn't connect with the carrier.

In both cases dialling *#06# on the phone, I can read the two IMEI and the MEID codes and they agree with the codes printed on the phone box.

Moreover, if I install an app (I tested with some of them) that reads the SIM card it can read the name of my carrier and all the contacts that are on my SIM.

Things that I tried:

0) I tried to use my SIM in another phone, and it works. I also tried to use another SIM in my phone, and I have the same problem.

1) I tried to install several ROM's:

- Jeff72ROM (v1.30 and v1.32) from: http://www.needrom.com/category/zte/serial-nubia/z11-mini/

- stock ROM from http://4pda.ru/forum/index.php?showtopic=776504&st=0#entry52586301

- And experimental port of CM14 (I can't remember where I found it)

- CUOCO92 from http://blog.grossoshop.net/nubia-z11-mini-rom-gs-by-cuoco92/

- An "official" ROM: NX529J_Z69_EN_NSXPK1JD00K132 from http://www.nubia.com/es/support.php?a=phone&pid=8 (this is the ROM that bricked my phone, I modified it in order to avoid the problem).

To install all these ROM I used TWPR from http://www.androidbrick.com/download/z11-mini-nx529j-twrp-root/

When I dial *#*#4636#*#* on the phone it says that the type of preferred net is WCDMA. It seems to me that these nets are not in use in Europe (I live in Spain). Itried to change that, but I couldn't. Then I applied the patch http://xdaforums.com/showthread.php?t=2394689 but it doesn't work. I also tried to modify the properties in "build.prop" without success. Now I think this is not the problem since all the ROM's have similar properties, in special CUOCO92 that is reported to work in Italy.

What I think it happened:

When I tried to flash the "official" ROM it failed because it tried to write too many files in the "system" partition (I hadn't this problem with any other ROM). Then I realised that my phone was bought in China and this ROM was for the international version, perhaps the international version has a different partition scheme).

What I did is to remove some very easy to install apps (i.e. google maps) in the ROM in order that the remaining apps fit in the partition, but then I made the mistake to activate the option in TWPR of making "rm -rf" instead of a "format". It seems to me that with this option the rm command followed some link to another partition and removed some files that shouldn't be removed, and those files are not in any ROM.

Does anybody think that this makes sense?

What can I do?