BackspaceTeam
Eternal Poster
How to change IMEI on TP Link Archer MR200 4G LTE WiFi Router
Disclaimer: I did not confirmed whether the IMEI has been changed (You can confirm via serial converter) I am not responsible if your device gets bricked or sim card gets blocked! 
This method enables us to change the imei of the modem.
Requires Android Debug Bridge (ADB) utility - You do not have permission to view the full content of this post. Log in or register now.
1. Download the ADB for your operating system and extract it somewhere (Windows), on Linux just install it using apt package manager.
2. Unpack the archive, open Command Prompt and change directory to that folder.
3. Factory reset the TP Link, then plug in the LAN cable or connect via WiFi.
4. Execute the following to gain access to the modem and change IMEI:
Change
5. Enjoy!
CTTO: 4pda forum, Openwrt forum and @r1bnc#4506 of Backspace Team
Disclaimer: I did not confirmed whether the IMEI has been changed (You can confirm via serial converter) I am not responsible if your device gets bricked or sim card gets blocked! 
This method enables us to change the imei of the modem.
Requires Android Debug Bridge (ADB) utility - You do not have permission to view the full content of this post. Log in or register now.
1. Download the ADB for your operating system and extract it somewhere (Windows), on Linux just install it using apt package manager.
2. Unpack the archive, open Command Prompt and change directory to that folder.
3. Factory reset the TP Link, then plug in the LAN cable or connect via WiFi.
4. Execute the following to gain access to the modem and change IMEI:
Code:
> adb connect 192.168.225.1
> adb shell
# echo "351234567890123" > /misc/imei
# uci set product.lte.imei=351234567890123
# uci commit
Change
351234567890123 to your preferred IMEI.5. Enjoy!
CTTO: 4pda forum, Openwrt forum and @r1bnc#4506 of Backspace Team