I explain my problem.
I bought it a few Blacview Zeta, this phone encountered problems with the GPS and network reception problems.
I thought, "How bad idea" that I went searching on the internet an official rom to see if the problems could beings corrected.
I went to the official website of BlackView then I followed a link to download the rom.
While Roma are available on their official forum, so I download with confidence, I flash the phone, I restarts the phone and then surprise the display is illuminated but a black screen with vertical and horizontal lines.
The phone responds well to touch and hear different sound when you click on the screen. But we see nothing except the lines.
So I posted on the forum, but none of my posts do appear, I send messages directly to the contacts available on the official website no answers.
So I searched the internet for several days so I found other Roma.
I found three different rom a v0.5 and a v0.6 v0.7 but the problem remains the same at the screen.
I also saw the other person have the same problem as me, but she did not find one solution.
To me it seems that this is a graphic driver problem, a hardware modification to the model to be made that I own.
So I'm looking desperately this rom "S509_G3_Blackview_Zeta_V1.2_20160309" which is the one that corresponds to my phone.
I know my message is long, but I tried to explain to me the best.
Anyway thank you to everyone who can help me