Lenovo Vibe Z90-7 Hebrew support

Hi everyone.
I have recently bought the phone from Tinydeals.com in China.
Its data is: Android 5.0.2, Build No: VIBEUI_V2.5__1518_5.169.1_ST_Z90-7, Processor: 8Cores1.7GHz, RAM 3GB, Running memory: 32 GB.
In its ads it was specifically written that the phone is multilingual and supports also Hebrew.
When I got the phone I found contradictory data, as follows:
Tapping Settings > Language I found and chose Hebrew, no problem.
But, tapping on the built-in browser settings > country/languages I found only a list of 21 countries + "General". Israel was not mentioned in the list.
As a result i am stuck in the following situation:
1. I can surf the Internet through the built-in browser only to left-to-right languages websites.
2. Using Google Chrome ( downloaded from the Google appstore ) I am able to surf all websites including the Hebrew ones.
3. I cannot use Gmail, and other apps, as i see Gibberish instead of any Hebrew letter.

On top of it, the "phone" and "Chrome" icons are concealed within a "Files" folder, and cannot be shown independently on the screen.

Tinydeals suggested me to flash the ROM through the link:
.

My questions are:
a. Should I follow the suggestion?
b. Is the ROM supporting the Hebrew language?
c. Can I restore the phone to its original state in case the flash fails?
d. How can I show the "Phone" and "Chrome" icons separately from the a.m. folder?
I will highly appreciate any help in solving this annoying situation.
Alex

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