Na xda jest temat:
Make a backup of all your data: Easiest way is to boot up a custom recovery (
see this thread ) and make a Nandroid backup to an external
SDcard . Alternatively backup the apps with Titanium Backup and copy the internalSD cardby hand.
Flash a dual-SIM stock firmware: Find a stock firmware that matches your region best
on this site (search for "XT1562" and "DS" for dual-SIM). Follow
this guide completely for flashing the firmware on your device.
Flash your favorite ROM (e.g.
@squid2's CM 12.1 , it's running great), or just stay with the stock ROM.
If you're on stock ROM, flash a custom recovery (
see this thread again ) and root your device by flashing SuperSU from the recovery.
Restore your Nandroid or Titanium backup.
Add the following lines (needs root) to a new file /data/local.prop or append it at the bottom of /system/build.prop:
Code:
ro.gsm.data_retry_config=default_randomization=2000,max_retries=infinite,1000,1000,80000,125000,485000,905000
persist.radio.plmn_name_cmp=1
persist.radio.force_get_pref=1
persist.radio.multisim.config=dsds
I'd prefer the /data/local.prop, as you do not need to make the change on every ROM update. Make sure that either file has permissions 644 (by 'chmod') and is owned by root:root (with 'chown').
Finally, reboot one last time.
Czyli rozumiem że należy przeflaszować softem Dual Sim, ale później można przeflaszowć np oficjalnym dla Polski? I mimo to ds będzie działać?