What about getting a new motherboard instead? 
https://www.aliexpress.com/w/wholesale-motherboard-blackview.html
https://www.dhgate.com/product/blackview-bv9500-new-mainboard-4g-ram-64g/450190310.html

This is an acceptable option. But will Sophie agree to send me a new motherboard? I dont know. She again did not find a video and photo of my problem in her inbox.)))
 I don’t even know what to think now))) In my email this letter has the status of "sent."))) Probably the message got into SPAM ...
Replace motherboard for me will not be a problem...

Admin has a good idea there if you can stand to lose any data that you had on the phone, which frankly if you're talking about replacing the mmc anyway, yeah, that data's gone already.

Like mine. I took my phone underwater. It fried.

Sometimes you can bring one back by rinsing away all of the chemicals from the board, but it has a much better chance of success if you can remove your battery immediately. Of course on our phones.....

I took mine apart in hopes of restoring it, video playlist here:

https://www.youtube.com/playlist?list=P ... I_Ivkt73un

It's long, but I show the motherboard, a couple of the chips.... Not sure which is which and not all are exposable. It may help but I think Admin's idea is the far easier way to go.

Replacing motherboard is not a problem for me. I don't know if Sophie will send me that part... That would be nice.

Joe37 wrote:

Replacing motherboard is not a problem for me. I don't know if Sophie will send me that part... That would be nice.

You may ask for that

 There's a little problem. Server qq.com does not accept messages from servers mail.ru and gmail.com. Sophie can't get a malfunction video from me. Please tell me, from what servers do messages come from Russia?

Joe37 wrote:

:) There's a little problem. Server qq.com does not accept messages from servers mail.ru and gmail.com. Sophie can't get a malfunction video from me. Please tell me, from what servers do messages come from Russia?

Just upload the video on youtube, then send it to her via skype

))) Sophie can't open the YouTube video link. And does not see the link to the video in my message... The letter was found and I have already answered it. This means messages from the server mail.ru delivered. I don't know what's going on. I was asked to send the file to 418 MB in a message on 1500601253@qq.com... Why not open the link???
Maybe downloading files from YouTube is prohibited by the law of the people's Republic of China? I'll send it to Skype...

)) I sent her a video on Skype... Let's see what happens... Why in this forum all is simple and clear as it should be? And girls from the After-Sale experience difficulties with communications... I do not understand...

dear admin, can you show Sophia my video?