TL-MR100 v3.8 (IN) firmware upgrade failing (Error 4503) – EU firmware shown on India site?
TL-MR100 v3.8 (IN) firmware upgrade failing (Error 4503) – EU firmware shown on India site?
Hi everyone,
I’m facing an issue while upgrading firmware on my TP-Link TL-MR100 router and need some guidance.
Device details:
- Model: TL-MR100
- Hardware version: v3.8 (IN) (as printed on router label)
- Firmware version (current): 1.5.0 0.9.1 v0001.0 Build 240528 Rel.69024n
- Hardware version (UI): TL-MR100 v3.8 00000002
What I did:
- I went to the official TP-Link India download page:
https://www.tp-link.com/in/support/download/tl-mr100/v3/#Firmware - I set the website region to India.
- It only shows this firmware:
TL-MR100(EU)_V3_1.7.0 Build 251121 - I downloaded the file:
TL-MR100(EU)v3_1.7.0_0.9.1_[251121-rel40531]_up_boot_All_Release_2025-11-21_14.09.48.bin
Problem:
- Firmware upgrade via router web UI fails with:
Error code: 4503 – The uploaded file was not accepted - Tested on Chrome and Firefox → same result
- File integrity seems fine (downloaded multiple times)
Why I need this update:
The firmware includes important features:
- OpenVPN / PPTP / L2TP VPN client
- Cell Lock feature (main requirement)
- Updated ISP profiles
Confusion:
- Why is EU firmware being shown on the India support page?
- My router is clearly IN version (v3.8) — is EU firmware incompatible?
- If yes, where can I get the correct firmware for this device?
Questions:
- Is TL-MR100(EU) firmware incompatible with TL-MR100(IN)?
- Is there a separate firmware for IN variant (v3.8)?
- Any way to enable Cell Lock feature on the IN firmware?
- Does Error 4503 indicate a region mismatch?
I’d really appreciate any help or clarification.
If TP-Link staff can check this, please confirm the correct firmware or update the India download page.
Thanks!
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That is wonderful news! I truly appreciate the team taking the time to acknowledge this and for working on a transition path for the IN-region hardware. It’s great to see TP-Link supporting its users this way.
Since I am planning a project that relies on the Cell Lock and VPN Client features, would it be possible to provide a rough ETA for this interim build? I am specifically waiting for the Cell Lock and VPN Client features for my current project. Also, will this interim firmware be posted publicly on the India support page, or will you be sending it to me directly via DM/Email?
Thank you again for your help and for looking into this solution!
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Hi,
The interim firmware for the TL-MR100 has been sent to you via a private message. You can update it via the router's web UI. Below are the instructions.
How to upgrade the firmware of TP-Link 5G/4G Routers
After that, visit our official website, download the latest firmware for the TL-MR100, and update the router to that version.
Notes: This firmware can not be degraded to the previous version.
Best Regards
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Hi Team,
I wanted to provide a quick update and a huge thank you!
I have successfully flashed the interim firmware you provided, followed by the latest official version from the TP-Link website. My router is now running perfectly on: Firmware Version: 1.7.0 0.9.1 v0001.0 Build 251121 Rel.40531n
The Cell Lock and VPN Client features are now fully functional and working as expected. I truly appreciate the support team’s fast and effective resolution—going the extra mile to provide this bridge for the IN-region hardware was a fantastic solution.
Best regards,
Sandesh
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@sandeshsahu Hi, I'm glad to hear that your router is updated and that you enjoy the new features. 
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Solla-topee wrote
Hi,
The interim firmware for the TL-MR100 has been sent to you via a private message. You can update it via the router's web UI. Below are the instructions.
How to upgrade the firmware of TP-Link 5G/4G Routers
After that, visit our official website, download the latest firmware for the TL-MR100, and update the router to that version.
Notes: This firmware can not be degraded to the previous version.
Best Regards
Hello, this is Dr Vaisakh, a new user of TP link MR100, India firmware with version 1.5.0 0.9.1 v0001.0 Build 240528 Rel.69024n and hardware version of TL-MR100 v3.8 00000002..
I am facing the same issue as the user " sandeshsahu" and I am unable to upgrade to the latest EU firmware..
Kindly request to forward me the interim firmware file so that upgrade to latest EU firmware can be done to get the latest feature of VPN client support and cell lock function..
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@Dr_Vaisakh_V i could send you but not sure if its only for my device or universal mr100 v3 from indian varrient
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From your device details it seems the same device with same hardware. It will be really helpful if you can send it as a PM or to my mail ID, vdrvaisakh@gmail.com..
Thanks for the support..
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Hi,
The interim firmware for the TL-MR100 has been sent to you via a private message. You can refer to this post to update the firmware and check if it helps.
Best Regards
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Happy to share that the interim firmware worked perfectly and successfully upgraded to latest EU firmware. An additional step was to factory reset after final upgrade. Device management has become smooth. VPN and cell lock function is enabled and working fine..
Thanks and regards.
Solla-topee wrote
Hi,
The interim firmware for the TL-MR100 has been sent to you via a private message. You can refer to this post to update the firmware and check if it helps.
Best Regards
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