The page https://wiki.teltonika-networks.com/view/TRB500_Firmware_Downloads displays the same MD5 checksum for TRB500_R_00.07.06_WEBUI.bin as for TRB5_R_00.07.05.4_WEBUI.bin but a different one than the one displayed on https://wiki.teltonika-networks.com/view/TRB5_Firmware_checksum_list.
I guess someone needs to update the MD5 checksum on the download page (from 82eba4ddad7a78d4b465710334bce570 to b9a97a5b5499e524922ca1721a93a4bb).