S5 Restarting randomly, imei unknown, baseband version unknown. What can I do?

Connoian

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S5 Restarting randomly, imei unknown, baseband version unknown.

My S5 G900F is restarting every two to three minutes, then only during this is showing imei unknown, baseband version unknown, and its says device status custom? Then when it reads sim it shows all the relevant information in about device, plus it then shows device status as official? Anyone got any ideas whats going wrong with phone. Thanks in advance.
 

ironass

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Re: S5 Restarting randomly, imei unknown, baseband version unknown.

My S5 G900F is restarting every two to three minutes, then only during this is showing imei unknown, baseband version unknown, and its says device status custom? Then when it reads sim it shows all the relevant information in about device, plus it then shows device status as official? Anyone got any ideas whats going wrong with phone. Thanks in advance.

Is your phone rooted or ever been rooted?
 

Connoian

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Re: S5 Restarting randomly, imei unknown, baseband version unknown.

I just bought it and the owner said it has not been rooted but obviously I think it has. One minute it worked perfectly, the next it is malfunctioning. I am going to install the stock firmware, hopefully this will work.
 

ironass

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Re: S5 Restarting randomly, imei unknown, baseband version unknown.

I just bought it and the owner said it has not been rooted but obviously I think it has. One minute it worked perfectly, the next it is malfunctioning. I am going to install the stock firmware, hopefully this will work.

My initial thoughts were either... a corrupt /efs file or the phone had been blacklisted.

Good luck.
 

Connoian

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Re: S5 Restarting randomly, imei unknown, baseband version unknown.

It was water damage. The previous owner did not inform of that.
 

Connoian

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Re: S5 Restarting randomly, imei unknown, baseband version unknown.

I have another S5 that shows the H+ symbol but will not enable mobile data? It was bought in germany o vodafone and now is in use in the UK. The network and mobile signals are really poor. Always stopping. Any ideas.
 

ironass

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Re: S5 Restarting randomly, imei unknown, baseband version unknown.

I have another S5 that shows the H+ symbol but will not enable mobile data? It was bought in germany o vodafone and now is in use in the UK. The network and mobile signals are really poor. Always stopping. Any ideas.

What are the exact firmware details and Product code as per #1.8 of 42 Galaxy S5 models - Dummies Guide
 

Connoian

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Product code SM-G900FZKAVD2
AP G900FXXU1BOL3
CP G900FXXU1BOL3
CSC G900FVFG1BOL3
If I can fix this signal/network problem I can sell it at a much better price. Thanks.
 

ironass

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Product code SM-G900FZKAVD2
AP G900FXXU1BOL3
CP G900FXXU1BOL3
CSC G900FVFG1BOL3
If I can fix this signal/network problem I can sell it at a much better price. Thanks.

Try flashing the stock Samsung O2, U.K. firmware below, by following the instructions and video in #1.11 of 42 Galaxy S5 models - Dummies Guide, and see if this resolves your issue.

Model SM-G900F
Model name GALAXY S5
Country United Kingdom (O2)
Version Android 5.0
Changelist 5508620
Build date Mon, 23 Nov 2015 05:29:35 +0000
Product code O2U
PDA G900FXXU1BOK6
CSC G900FO2U1BOJ1
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