Here the ubi and img file links for TRB1450 and TRB1451:
https://mega.nz/folder/65ECxTQa#j7OX-tJ5jZRL_S6lO2yAuw -> TRB1450
https://mega.nz/folder/flckyZZI#iYHnWs9J2CUwKK_N3GxYZA -> TRB1451
Note: Kindly use the img and ubi files with the matching product code. After recovering the device the firmware of the device will be 1.06.1. To upgrade the firmware to the latest one kindly refer to this link: TRB145 Legacy FW Upgrade Instructions - Teltonika Networks Wiki (teltonika-networks.com)
I hope it helps.