ttlhelp

hello, i have this dvr iDS-7216HQHI-M1S, it shut down while updating, i know how to restore firmware using ttl my pc ip is 192.0.0.128 i can ping with 192.0.0.64 i open putty then pressed ctrl+u to stop autoboot... the start of line is HKVS $ when i insert: setenv ';printenv' no thing happens at...