RS-232 Control of SL420 Chassis TVs

Hello everyone, I have two Loewe TVs of chassis SL420. They were both running on firmware v4.1.17.0 and I was able to control them via serial commands specified on this article (https://cdn.loewe.tv/manuals/ru/plus/Control Interface/control_interface_specification_SL3xx-SL4xx_V4.1.1.pdf) without any issue. Recently the client updated one of the to v4.4.42.0 and it stopped accepting commands. Any ideas what might be blocking it? did the serial protocol changed because of the update?

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