SM-G991B/DS E bit, patch certificate - GSM-Forum

Bm666666 · 01-05-2025, 05:33

Hi!

I have rooted my S21 to fix IMEI but, sadly, after buying Chimera subscribtion and rooting my device by Chimera for only this purpose; to fix the network. The network is not working at sim2. The only available is 2G on sim1.

I would really appreciate if Chimera find a solution for this model!! If no, I will appreciate any tips about any alternative tool that can help me with this device.

My friend is using S22 ultra which is repaired by Chimera and it is working perfectly!! It should work on older models since newer models which are more complicated is already fixed!!

**Chimera Tool** · 01-06-2025, 13:20

Dear User,

The 2G/EDGE problem is only present on Samsung S21 devices. We will try to fix it if we could find a solution for it.

Regards,
ChimeraTeam

Quote:

Originally Posted by Bm666666

Hi!

I have rooted my S21 to fix IMEI but, sadly, after buying Chimera subscribtion and rooting my device by Chimera for only this purpose; to fix the network. The network is not working at sim2. The only available is 2G on sim1.

I would really appreciate if Chimera find a solution for this model!! If no, I will appreciate any tips about any alternative tool that can help me with this device.

My friend is using S22 ultra which is repaired by Chimera and it is working perfectly!! It should work on older models since newer models which are more complicated is already fixed!!

Bm666666 · 01-06-2025, 15:27

Thanks for the explanation!

This issue with S21 is not solved for a while now through a lot of updatings! Would it be solved in the future or it is impossible to overcome by chimera?

It would be good to mention that in the compatibility page: https://chimeratool.com/en/models/sa...21-5g-sm-g991b
Because I renewed my membership and chose to root a intact phone and not go with CPID based on the confirmation and the success rate in this page!! Now it is unusable and I need to replace the whole motherboard

It was a little misleading.

Is this problem existed for S21+ (SM-G996B) & S22+ (SM-S906B)? Because I have the same problem with those another 2 demo intact phones

**Chimera Tool** · 01-06-2025, 15:37

Dear User,

This problem persists on the following devices:

Samsung Galaxy S21 FE 5G (SM-G990E)
Samsung Galaxy S21 5G (SM-G991B, SM-G991N)
Samsung Galaxy S21 Plus 5G (SM-G996B, SM-G996N)
Samsung Galaxy S21 Ultra 5G (SM-G998B, SM-G998N)

As soon as we find a solution for this issue, we will implement it to the tool.

Regards,
ChimeraTeam

Quote:

Originally Posted by Bm666666

Thanks for the explanation!

This issue with S21 is not solved for a while now through a lot of updatings! Would it be solved in the future or it is impossible to overcome by chimera?

It would be good to mention that in the compatibility page: https://chimeratool.com/en/models/sa...21-5g-sm-g991b
Because I renewed my membership and chose to root a intact phone and not go with CPID based on the confirmation and the success rate in this page!! Now it is unusable and I need to replace the whole motherboard

It was a little misleading.

Is this problem existed for S21+ (SM-G996B) & S22+ (SM-S906B)? Because I have the same problem with those another 2 demo intact phones

bkkioui · 01-14-2025, 20:44

i have same problem with samsung G991b binari 4

Bm666666 · 01-17-2025, 16:43

Try to download Google phone, set it as standard call manager app and type *#*#4636#*#*

From that list you can choose WCDMA Only and 3G will work with "H" or"H+" up on the phone.

3G would work perfectly on the phone until system restart.

I hope that Chimera team can add a patch so that we get this process happen automatically instead so we get at least 3G

Denor · 02-10-2025, 20:06

Samsung Galaxy S21 Ultra 5G
SM-G998N same problem with. Chimera team We are waiting for a solution to the problem since 2023. Please find a solution to the problem. The phone is as simple as a brick and lies at home. we will be grateful to you

coliotte · 02-13-2025, 04:54

happend to me with s21 plus

just dial *#*#4636#*#* and force lte
Download Google Dialer don't use the stock Samsung dialer it won't work.

Denor · 02-13-2025, 17:50

this is the radio info setting. when choosing LTE, the network is completely disabled and 2g is returned. you can only turn it on WCDMA, so that 3g works, the speed and output of which is 8-12 Mbps, and the slightest obstacle, bridges, large buildings, the speed becomes even less. also because of this there is no VoIP / VoLTE, why is the sound of the call transmission at the level of an old telephone, into which you have to shout

teammonoxide · 03-14-2025, 03:48

If you connect device to wifi, you can get 4G (but... useless since you're on wifi)

01-05-2025, 05:33	#1 (permalink)
Bm666666 Insane Poster Join Date: May 2006 Posts: 63 Member: 275869 Status: Offline Thanks Meter: 10	SM-G991B/DS E bit, patch certificate Hi! I have rooted my S21 to fix IMEI but, sadly, after buying Chimera subscribtion and rooting my device by Chimera for only this purpose; to fix the network. The network is not working at sim2. The only available is 2G on sim1. I would really appreciate if Chimera find a solution for this model!! If no, I will appreciate any tips about any alternative tool that can help me with this device. My friend is using S22 ultra which is repaired by Chimera and it is working perfectly!! It should work on older models since newer models which are more complicated is already fixed!!

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01-06-2025, 15:27	#3 (permalink)
Bm666666 Insane Poster Join Date: May 2006 Posts: 63 Member: 275869 Status: Offline Thanks Meter: 10	Thanks for the explanation! This issue with S21 is not solved for a while now through a lot of updatings! Would it be solved in the future or it is impossible to overcome by chimera? It would be good to mention that in the compatibility page: https://chimeratool.com/en/models/sa...21-5g-sm-g991b Because I renewed my membership and chose to root a intact phone and not go with CPID based on the confirmation and the success rate in this page!! Now it is unusable and I need to replace the whole motherboard It was a little misleading. Is this problem existed for S21+ (SM-G996B) & S22+ (SM-S906B)? Because I have the same problem with those another 2 demo intact phones

01-14-2025, 20:44	#5 (permalink)
bkkioui Junior Member Join Date: Nov 2021 Location: morocco Age: 28 Posts: 1 Member: 3000852 Status: Offline Thanks Meter: 1	i have same problem with samsung G991b binari 4

01-17-2025, 16:43	#6 (permalink)
Bm666666 Insane Poster Join Date: May 2006 Posts: 63 Member: 275869 Status: Offline Thanks Meter: 10	Try to download Google phone, set it as standard call manager app and type ##4636## From that list you can choose WCDMA Only and 3G will work with "H" or"H+" up on the phone. 3G would work perfectly on the phone until system restart. I hope that Chimera team can add a patch so that we get this process happen automatically instead so we get at least 3G

02-10-2025, 20:06	#7 (permalink)
Denor Junior Member Join Date: Oct 2023 Location: Turkey Age: 32 Posts: 3 Member: 3048499 Status: Offline Thanks Meter: 4	Samsung Galaxy S21 Ultra 5G SM-G998N same problem with. Chimera team We are waiting for a solution to the problem since 2023. Please find a solution to the problem. The phone is as simple as a brick and lies at home. we will be grateful to you

02-13-2025, 04:54	#8 (permalink)
coliotte Freak Poster Join Date: Jan 2015 Posts: 275 Member: 2323265 Status: Offline Thanks Meter: 47	happend to me with s21 plus just dial ##4636## and force lte Download Google Dialer don't use the stock Samsung dialer it won't work.

02-13-2025, 17:50	#9 (permalink)
Denor Junior Member Join Date: Oct 2023 Location: Turkey Age: 32 Posts: 3 Member: 3048499 Status: Offline Thanks Meter: 4	this is the radio info setting. when choosing LTE, the network is completely disabled and 2g is returned. you can only turn it on WCDMA, so that 3g works, the speed and output of which is 8-12 Mbps, and the slightest obstacle, bridges, large buildings, the speed becomes even less. also because of this there is no VoIP / VoLTE, why is the sound of the call transmission at the level of an old telephone, into which you have to shout

03-14-2025, 03:48	#10 (permalink)
teammonoxide Insane Poster Join Date: Nov 2014 Location: Sokovia Posts: 73 Member: 2300259 Status: Offline Thanks Meter: 8	If you connect device to wifi, you can get 4G (but... useless since you're on wifi)