Blackview BV5800 MT6739 Oreo 8.1 FRP problem from ebay - General Questions and Answers

Hi This is my first post here. I have done some searching and reading but I still have a problem.
I bought this phone off ebay with a broken screen as a project. I managed to replace the screen and got it working (first time doing this for me) but the phone has a pin and google lock that I didn't consider.
The seller isn't replying to my question of what is the pin.
I checked the IMEI numbers on IMEI24.com and it's not showing as stolen. I have attempted common pins with no luck.
I have done a factory reset to wipe the data. I have tried to flash the phone from the SD card but it's not working (see photo)
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E: footer is wrong
E: Signature verification failed
E: error: 21
I've tried 2 different firmwares but same error each time.
The phone shows up in windows as attached to the PC but won't show any files and doesn't show up for 4uKey for Android. I've attempted to use adb but it won't connect to the phone either using CMD in admin mode.
I'm not a coder and I'm not that good with command prompt software.
Have I got any chance with this or do I just give it up as a bad job?
It seems a shame to junk a now working phone. But I know now not to buy a broken screened phone again!

27 views and no replies.
I'm going to give it up as a bad job and break it for parts. The battery is good at least and there's a chance that I can salvage the screen as well as being good practice for repairs.
If the board is locked is it any good to anyone?

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Trouble with n8010 - get pit on mapping ...

Hi folks!!!
I have 2 galaxy note 10.1 (2012).
One of them had already put twrp several times and different roms without problem. Now there is no way to enter the recovery, it stays in the logo. I can not use odin either because it stays in get pit for mapping and from there it does not happen. I already tried to load several pits of this page but nothing. Also download an official rom but neither. There is no way to fix the tablet.
The other was never done anything, it was such a factory but, although it worked, there was no way to enter the recovery until one day did not pass the logo.
I have used windows 7 with the drivers, now there is no way and I have had to use windows 10 and if it recognizes the tablet but it still does not pass the get pit for mapping ...
I've also tried from Linux with fastboot devices but it does not recognize anything.
Any help ?. I know it's an obsolete tablet but my son worked to see the YouTube videos.
Attached 1 capture in case they are useful.
I've spent a lot of time with this problem and trying and reading but there's no way.
Thanks and sorry for bothering.
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See your identical post .
You need a service center repair .
JJEgan said:
See your identical post .
You need a service center repair .
Click to expand...
Click to collapse
Thanks. is it the only way?.

Problem with enable root access - Lumia 1020 [64GB Edition]

Hello world!
Over a month ago I bought (online auction) a specific model of the Lumia 1020, specific because the 64GB edition (German).
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I flashed it with his original rom, because after a reset to the factory settings, a few applications were missing, e.g. "Lumia Camera". Now I've got everything that was missing. I was able to unlock the bootlader without any problems (I think so)
I was able to get into Mass Storage mode (Windows showed me the system files of the phone).
But when I try to root that phone in Mass Storage mode, then I see this message:
I also tried option: "Enable Root Access on ROM images" unfortunately, in the end, after all the steps that have been taken, the same message pops up. I really want to have root access to my phone, what should I do in this situation, try to flash phone with "prerooted" 32GB ROM from other phone or something like that?
I already have some files on it, because I've taken a lot of photos and videos, but it wouldn't be a problem for me to make a backup, but it would be nice if I could get root access without this option to combine with other ROM's. I think, the option is that the WPinternals has a problem with rooting this model, because that model has originally unsupported "EFIESP" to run enable root script. I'm a beginner in Windows Phone, because my adventure with him has just begun. I'm counting on your help. I also apologize for potential grammatical errors, but this is not my native language, so sometimes I would like to use some untranslatable phrases and it looks funny in a further context. Greetings.
P.S. I'm uploading a photo before I unlock the bootloader.
Still nothing new
After many attempts, still nothing new.

zenfone6 unlock bootloader error, keep saying network problem

Hi,Guys~
I can't get the bootloader unlock, Cause it keep saying like the picture shows.. Whatever fimware I use or official Unlock Device Tool(9.1.0.8-9.1.0.11) app. It can't be done. Including android P(16.1220.1909.194 &a lot of P version) to Q(17.1810.2005.153).
"An unkonw error occurs, which may be a network connection issue.please wait and try again later"
Actually network can surf totally no problem, but just can't unlock.I had try both of cyanogenmods unlock method can't work.
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There is any way back to the older(older than 16.1220.1909.194) or the first fimware? I think maybe it's the fimware 16.1220.1909.194 newer than the unlock apps...I tried the ADB but cant wrrote the older fimware...
Sry for the image...looks like it can't show out by google cloud drive.
Plz help me guys.
Thx a lot.
same problem here. i tried the 1st firmware that came with it 2019 april .still same problem. this happened after i gave it service regarding a problem which is taking too much time to open gallery. they have reflashe the phone and gave to me with AndroidQ. i tried to unlock with the asus tool. it says network issue. then i downgraded to 16.1210.1904.75
and tried with no success. any help
Did you finally solved this problem?
I saw somewhere people saying to remove device pin before you try unlocking bootloader. I guess you can try that.
Anyone found a solution for the bootloader unlock?

Boot Loader Logs: Start Up Failed

The phone fell and now when I turn it on I get a black screen with the header titled 'Boot Loader Logs' with the following message.
Your device didn't start up successfully. Use the Software Assist on Computer to repair your device. Connect your device to the computer to get the Software Assist.
Funny thing is when I do plug it into the computer -- nothing happens.
The phone it self recognizes the usb is plugged in and nothing more.
No boot-able A/B slot -- don't know what that means. Basically, is there anyway i could get this up and going without removing everything on the device ?
Mnd you im a noob to all of this so please take it easy.
I'm open to everything.
Good morning, I just had that problem since yesterday, I think a general formatting was done, even to the cell phone imei, I don't know if I can pick it up, I need help please, pdt: I don't know how to write so much in English, I speak Spanish
jhosuach said:
Good morning, I just had that problem since yesterday, I think a general formatting was done, even to the cell phone imei, I don't know if I can pick it up, I need help please, pdt: I don't know how to write so much in English, I speak Spanish
Click to expand...
Click to collapse
I investigated more, I realized that there is only slot a, b does not recognize, but at the moment of completely formatting with the data, it does not start
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Android 10 PIN bypass without data loss

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Hi guys first time posting,
So before I start I’m sure this type of topic as been asked millions of times and I’m not posting this blind, I have put in some research into it albeit with my limited knowledge. I’m 90% certain this is a lost cause but here’s to hoping this community can help.
My mother has given me my uncles old phone after he passed away with the task of retrieving old family photos. It’s PIN locked and despite trying lots of possible combinations I’ve had no luck.
There is no custom roms installed and I doubt debugging is turned on, when plugged into a laptop it’s not recognised by the system (I believe the mode needs switching, but requires PIN to access that)
The phone in question is: Motorola G9 Plus
The phone does have a SDcard slot.
Any advice/help would be greatly appreciated.
Do a Google search for "Motorola G9 Plus FRP Unlock Tool".
xXx yYy said:
Do a Google search for "Motorola G9 Plus FRP Unlock Tool".
Click to expand...
Click to collapse
Does this not require factory reset? I’ve watched a couple of the videos and read a few articles, they all seem to start from a fresh install.
I’m currently locked at the PIN screen and don’t know how I would get to that stage without factory resetting

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