Below are tools that might be useful for analysis and hacking of the device:

lkctl

Meant to be interface to IPTV_CMD service

ittk

Aimed to become toolkit for handling ITE firmware images. For now allows to unpack ITEPKG container

otl-lkv373a-tools

Set of small tools made by jhol to help reversing the device internals. Most important here is SMAZ decoder that is able to decompress SMAZ blob with no errors.

objdump port for encoder CPU

Legacy port of objdump to LKV373A (now identified as OpenRISC 1000). Not maintained.

radare2-or1k

radare2 plugin for OpenRISC 1000 architecture. Allows reversing some parts of firmware (second half is ARM code).

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For the LKV373 without A:

lkv373-tools

miscellaneous tools by kitten_nb_five

free-373

A beginning of an FOSS firmware for the 373 V2