Update impossible "variant system version"

[b21500184]

Hello , first my phone work with : Android version : 6.0 / HTC Sense version : 7.0 /
software number : 3.35.617.12
SORRY FOR MY BAD ENGLISH ... IM FRENCH

I bought a second-hand HTC One M9 in france 1year ago. When I just come back to home , I wanted to check if software updates was OK but It wasnt ok. The phone suggest me to dowload the software update number : 3.35.617.16. So I did it but its impossible to install it , I cant see :

"Variant system version-
We have determined that your phone may be running a modified version of its system sofware. For your protection,we cannot update your phone. Please revert your phone to the official Htc system software to update your phone. If you didnt modify your system software or would like help reverting your system , please contact us via the support section at htc website".

I already try to talk to HTC support but they cant help me anymore.

CAN SOMEDY HELP ME PLEAAAASE ?

Thank you very much.

Informations about my phone from HTC support : So, this IMEI is related to an HTC One M9 manufactured to be used in USA with the carrier called T-Mobile. Its warranty expired on march 26th of 2016".

 

[VidJunky]

I think HTC was one that if the device had been rooted or the Bootloader unlocked would display "Tampered" above the text ***LOCKED*** so you seem to have a legit version of the device. Since you are out of warranty, you might look into rooting the device yourself and updating to the version you want. Know that the M9 has a root key out there along with several ROMs. Given its age you may have to dig a little to find them but I would recommend checking this all out at the DXA Developers site. You might also post this question in the M9 forums there as someone may be able to help you without root. Definitely an easier and less risky solution.

 

[mustang7757]

That's the problem with buying phones 2nd hand , this tells me someone messed with the phone , S-Off means it's been tampered with they turned security off and why your getting the warning.

 

[VidJunky]

That's the problem with buying phones 2nd hand , this tells me someone messed with the phone , S-Off means it's been tampered with they turned security off and why your getting the warning.

Good catch. I just remembered a banner on one of my HTC models that said tampered at the top after rooting it. I never looked much farther but you're right that should say S-On. Well it should be supper easy to root then, so on that note getting the ROM you want just got a bit easier.

 

[mustang7757]

Good catch. I just remembered a banner on one of my HTC models that said tampered at the top after rooting it. I never looked much farther but you're right that should say S-On. Well it should be supper easy to root then, so on that note getting the ROM you want just got a bit easier.

If they were to root , I would recommend knowing how to get back to stock and if any support is out there for this device .