ATU-L21 baseband unknown help [Answered] - GSM-Forum

zeddicus · 01-30-2022, 18:51

Hello,

I am trying to repair a ATU-L21 with null emei.
It shows no baseband information, so baseband is unknown.
I have done any imaginable thing I have found on the internet with no success in repairing the baseband so that IMEIs show.

Do anybody have any idea about how to fix unknown baseband on this phone?

I am inserting an image:

https://ibb.co/jVwy16q

Thanks

Octopus support · 01-31-2022, 08:44

Hello.

What operations have been performed before?

Also, what is the state of the device now?

zeddicus · 01-31-2022, 17:39

Quote:

Originally Posted by Octopus support

Hello.

What operations have been performed before?

Also, what is the state of the device now?

Hello, I received the phone from another workshop with a board firmware flashed, no imeis, no baseband.

I restored the phone with functional firmware, attempted imei repair, but I noticed the imeis do not show because there is no baseband.
And I have not being able to restore the baseband.
I tryed another board firmware, repair imei, flashed back stock, checked imei again.
It is currently on ATU-L21 AUM Atomu-L21 8.0.0.133 C432, still no baseband and no imei.

Thanks

smtel · 01-31-2022, 20:22

Flash back board software. Wait when device fully power ON and check "Device Manager" - "COM Ports" - if you see "Qualcomm Diag Port" just write QCN (from other ATU-L21 or other device with the same CPU) via QPST, reboot device, check baseband, if all ok - repair imei/model/mac etc... After flash stock firmware.

Octopus support · 02-01-2022, 09:12

Hello.

You can try use Board Firmware from Support Area

Quote:

(Path:/Huawei/Huawei Board Firmware/A-series/ATU-L21/...)

zeddicus · 02-01-2022, 21:58

Quote:

Originally Posted by smtel

Flash back board software. Wait when device fully power ON and check "Device Manager" - "COM Ports" - if you see "Qualcomm Diag Port" just write QCN (from other ATU-L21 or other device with the same CPU) via QPST, reboot device, check baseband, if all ok - repair imei/model/mac etc... After flash stock firmware.

How could I back up the qcn?

I might be able to get another functional phone, but how to make the backup in a huawei without damaging the phone in the process?

Thank you for the suggestion.

zeddicus · 02-01-2022, 21:59

Quote:

Originally Posted by Octopus support

Hello.

You can try use Board Firmware from Support Area

I will try that along with the previous solution.

And post results.

smtel · 02-02-2022, 07:50

Quote:

Originally Posted by zeddicus

How could I back up the qcn?

I might be able to get another functional phone, but how to make the backup in a huawei without damaging the phone in the process?

Thank you for the suggestion.

Try this QCN, from working phone (no have for ATU-L21)

01-30-2022, 18:51	#1 (permalink)
zeddicus Freak Poster Join Date: Jan 2010 Location: Cuba Posts: 219 Member: 1202427 Status: Offline Sonork: 100.1604781 Thanks Meter: 27	ATU-L21 baseband unknown help [Answered] Hello, I am trying to repair a ATU-L21 with null emei. It shows no baseband information, so baseband is unknown. I have done any imaginable thing I have found on the internet with no success in repairing the baseband so that IMEIs show. Do anybody have any idea about how to fix unknown baseband on this phone? I am inserting an image: https://ibb.co/jVwy16q Thanks

01-31-2022, 08:44	#2 (permalink)
Octopus support Product Supporter Join Date: Jan 2019 Location: USA, New York Posts: 10,250 Member: 2891705 Status: Offline Thanks Meter: 2,162	Hello. What operations have been performed before? Also, what is the state of the device now?

01-31-2022, 20:22	#4 (permalink)
smtel Freak Poster Join Date: Sep 2005 Location: SPB Age: 45 Posts: 304 Member: 182653 Status: Offline Thanks Meter: 115	Flash back board software. Wait when device fully power ON and check "Device Manager" - "COM Ports" - if you see "Qualcomm Diag Port" just write QCN (from other ATU-L21 or other device with the same CPU) via QPST, reboot device, check baseband, if all ok - repair imei/model/mac etc... After flash stock firmware.