Problems after downgrade from EMUI 12 to 10. - Huawei P30 Pro Questions & Answers

My phone is P30 Pro VOG-L29.
After doing downgrade from EMUI 12 to EMUI 10, my phone have lost connection with PC via usb.
I tried return to EMUI 12 with software update from system menu/my huawei app and easy recovery but phone finds no update.
Please help me with this mess

Check phone USB options?!

Checked...
There is no as always, monit about usb mode type to select, so i go to developer opt and checked mtp but when i connect phone, mtp mode always jump to charge only, byself.

I very need to fix this.
IF someone guide me what should i do now, to back to emui 12 and fix usb connection issue...I'll pay via paypal for helping me with this.

Related

USB connection method defaults to usb storage

Hi there people, I have a rooted p7-l10 (no kingo or anything ) and i need to use phone on MTP mode, but whenever i plug in my device it resets my previous choice to usb storage again.
Let me clarify: nothing is broken, this isnt a root problem either.
I just want the phone to remember that i selected MTP and not always default to USB storage
I had the same problem on B126 and now that I'm on B621 it's reversed (a joke ), I mean it's OK, it remembers the last connection.
So, write your firmware and upgrade with OTA to a next version or full upgrade to B609. I did that and didn't loose data.
I am on B123, how would i go about updating? I tried downloading an update from the huawei site just after I got the device, but that seemed to be an unbuilt kernel... I have no OTAs waiting for me either... Must i find a B621 ROM and flash it in fastboot?

I need help :(

Hi everyone,
I got an P20 PRO Build: CLT-L29 9.0.0.159(C33E3R1P9) that as the following issues:
-FRP Locked
-Can't get into FASTBOOT mode (i press VOLUME DOWN, and i plug into computer and it just starts charging.
- I tried to Upgrade /Downgrade the firmware using OTG cable by dialing *#*#2846579#*#*
no sucess, i tried other fw packages to make sure...
-The i tried to use the Firmware Finder method, changing the router DCHP DNS, without any sucess aswell...
I don't know what to do, i really need some help :/
Have you try to downgrade in HiSuite?
masze said:
Have you try to downgrade in HiSuite?
Click to expand...
Click to collapse
Hey mate, well I think that I would need to get the phone into FASTBOOT mode, correct?
Somehow I can’t get the phone into that mode, I tried everything.
No, just connect your phone with hisuite on pc.
Possible can you downgrade there.
I can downgrade from 9 to 8 in hisuite

MTP problem

In the last 10 days i face strange phenomena. I stopped seeing my oneplus 3t phone when in recovery mode connected to pc running windows 10. when i connect it to laptop with windows 10 i do see the phone with the same cable in normal and in recovery mode.
I did uninstall and reinstall new microsoft MTP usb driver.
any idea or help will be appreciated

Loosing connection as soon as Fastboot starts

Hi
After googleing a lot and trying at least 1001 ADB and Fastboot-tutorials I still am stuck. I only want to flash my A2 with stock ROM, but as soon as fastboot kicks in the connection stops.
My phone is unstable (how? see below) but not bricked! I can ...
... access recovery mode and fastboot anytime
... establish data and PTP connections to my PC (Win 10)
... use it normally (apps, WLAN ...) as long as flight mode is on!!!!! :cyclops:
... connect the phone with XiaoMi Tool V2 to my PC
but as soon as fastboot kicks in I loose connection.
Meanwhile I'm out of ideas how to establish fastboot-connection.
Here's the reason I want to flash - in case it matters: After an Andorid update (or at least it seems this is the reason) the screen started to unlock/lock erratically. There never was enough time to enter the code, so I made a factory reset. The problem still prevails, but without screenlock (and looooots of patience) I can access my phone. Debugging and bootloader are turned on now. The only way to stop this screenlock/unlock behavior is to turn on flight mode ...
If the phone is connected to a PC I can hear the "unplug sound" as soon as fastboot starts and XiaoMi Tool V2 looses connection.
BTW: Even with many attempts I never managed to establish a connection to Mi PC suite.
And the USB-connection-preferences very often turn to "no data connection". To fix this I usually have to plug out/in or even change USBport or even the computer.
What should I try to flash mi Mi A2?
Thanks and greetings
Phillip
Philipp_P said:
Hi
After googling a lot and trying at least 1001 ADB and Fastboot-tutorials I still am stuck. I only want to flash my A2 with stock ROM, but as soon as fastboot kicks in the connection stops
My phone is unstable (how? see below) but not bricked! I can ...
... access recovery mode and fastboot anytime
... establish data and PTP connectios to my PC (Win 10)
... use it normally (apps, WLAN ...) as long as flight mode ist on!!!!! :cyclops:
... connect the phone with XiaoMi Tool V2 to me PC
but as soon as fasstboot kicks in I loose connection.
Meanwhile I'm out of Ideas how to establish fastboot-connection.
Here's the reason I want to flash - in case it matters: After an Andorid update (or at least it seams this is the reason) the screen startet to unlock/lock erratically. There never was enoug time to enter the code, so I made a factory reset. The problem still prevails, but without screenlock (and looots of patience) I can access my phone. Debugging and bootloader are turned on. The only way to stop this behaviour ist to turn on Flight Mode ...
If the phone ist connected to a PC I can hear the "unplug sound" as soon as fastbot starts and XiaoMi looses connection.
BTW: Even with many atempts I never managed to estabilsh a connection to Mi PC suite.
And the USB-Connection-Pfreferences very often turn to "no data connection". To fix this I usually have to plug out/in or even change USBport or even the computer (-> Win -Laptop)t! Whith no result.
What should I try to flash mi Mi A2?
Thanks and greetings
Phillip
Click to expand...
Click to collapse
Sounds strange . Does RIL work ? Like gsm and sim card ...anyway you need to buy a screwdriver from Amazon or Wish or Whereever and open your phone ..
Search for tutorial videos on youtube on " test point " . You will short the phone forcing it into edl ( deep flash ) mode . In edl you don't use fastboot but rather qualcomm 9008 drivers .
You can flash stock rom with QPST ( Qualcomm flash tool ) or just the regular Miflash from Xiaomi .
In any case ..UNINSTALL ALL I SAY ALL the stuff you have installed on your pc right now including adb .Reboot .Install Qualcomm 9008 drivers .Then download the LATEST VERY NEWEST version of Miflash that comes with drivers ..follow the instructions to install drivers and Mifash itself .
Then follow video tut to enter edl state with test point
VERY IMPORTANT HAVE MIFLASH PREPARED to flash very soon as in 1 or 2 minutes after you enter edl because there is a timeout after which you will get errors and would have to do the test point again ...
Good luck ..if the phone is stolen or contains stolen parts or you used some bypass to enter it to bypass lock screen once it connects to internet or gsm the troubles will most probably return ..if it was or is just some glitch this will solve it .
Thanks for your help!
I’m not familiar to what RIL is all about. I just googled it, and I guess it works. I can receive SMS when flight mode is turned off and I get a 4G-connection. I can’t do phone calls, but that’s due to the screenlock-problem as soon as flight mode is turned off. I can’t even enter a phone number then … :silly:
I never heard of edl before but found videos. I’ll give it a try. Thanks for all your tips, especially about the edl-timeout. :good:
One last question before I start regarding the uninstalling of EVERYTHING … How can I be sure, I got rid of EVERYTHING? Windows program uninstall showed be "Mi PC Suite", "Universal ADB driver" and "Windows driver package Android USB device class …" I uninstalled all of it.
But I also used Minimal ADB/fastboot and XiaoMi Tool V2 (and probably other stuff I don’t remember anymore) as portable versions. I can delete those fodlers, but is that really enough regarding the drivers that were installed?
Philipp_P said:
Thanks for your help!
I’m not familiar to what RIL is all about. I just googled it, and I guess it works. I can receive SMS when flight mode is turned off and I get a 4G-connection. I can’t do phone calls, but that’s due to the screenlock-problem as soon as flight mode is turned off. I can’t even enter a phone number then … :silly:
I never heard of edl before but found videos. I’ll give it a try. Thanks for all your tips, especially about the edl-timeout. :good:
One last question before I start regarding the uninstalling of EVERYTHING … How can I be sure, I got rid of EVERYTHING? Windows program uninstall showed be "Mi PC Suite", "Universal ADB driver" and "Windows driver package Android USB device class …" I uninstalled all of it.
But I also used Minimal ADB/fastboot and XiaoMi Tool V2 (and probably other stuff I don’t remember anymore) as portable versions. I can delete those fodlers, but is that really enough regarding the drivers that were installed?
Click to expand...
Click to collapse
sure for the portables just delete the folders
Giving up
Screwdrivers arrived, disassembling the phone was surprisingly easy. Actually hitting the tinytiny EDL-contacts was surprisingly difficult on the other hand. :silly: But I managed. But also with EDL my computer pretends my mobile doesn’t exist when plugged in. I guess there must be a hardware-problem somewhere. A this point I give up and buy another one. Thanks for your support, KevMetal.
Philipp_P said:
Screwdrivers arrived, disassembling the phone was surprisingly easy. Actually hitting the tinytiny EDL-contacts was surprisingly difficult on the other hand. :silly: But I managed. But also with EDL my computer pretends my mobile doesn’t exist when plugged in. I guess there must be a hardware-problem somewhere. A this point I give up and buy another one. Thanks for your support, KevMetal.
Click to expand...
Click to collapse
Sorry didn't work friend. Are you sure ? Did you remember to install Qualcomm 9008 drivers from Qualcomm ? Remembering to disable driver verification on windows 10 ...try just more time ...who knows ..
I used a computer with windows 7, because I found on the internet that there are less problems than with Win 10 …

Huawei P20 Pro (CLT-L09) does not turn on after rollback (maybe bricked)

So i rollbacked my huawei p20 pro (CLT-L09) with HiSuite Proxy to EMUI 8 from 9, it was rebooting after the installation and suddenly i got a message saying like that my image had a problem with 2 options, shut down and eRecovery, i chose negligently shut down so i would be able to restart it, now my screen does not turn on, i tried everything but still nothing, i cant connect to HiSuite but DC-Unlocker, HCU, MultiTool 8 and others recognizes my phone as usual, what can i do, thanks in advance, i am desperate.

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