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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