Encryption Phone GEM-703L/GEM-702L

Hi there!
I've recently bought this great phone and I've successfully installed 703L rom to 702L. I'm now on B111 with TWRP (english for 5.1.1), UNIVERSAL-CUST-B111 and rooted.

I've tried to encrypt the phone as usual (Security > Encrypt Phone) but the phone simply reboots and stuck on huawei logo...
I get out from boot through a manual poweroff (keeping power button pressed > 5 seconds) and the phone restarts normally.

Now, has anyone encrypted successfully the phone? Is it a problem of 703L rom backporting to 702L or a problem (like others) of partitioning and missing sectors to store encryption data?

Thank you all!

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