Software update for Daly BMS S-series models with newest software

I have an energy storage consisting of two 48V 200Ah LFP packages connected in parallel, each of which is managed by a Daly 16S 150A S series BMS. BMS-ST103-309E hardware version, 11_220211_277E software. It is an extended version of the BMS equipped with a DIO parallel port for parallel module control. It also has UART and CAN/485 ports. As Daly does not mark BMS variants anywhere, I attach photos for easier identification.

I have access to the BMS so far through BT communication modules and the Smart BMS application. Everything works reasonably correctly.

However, I wanted to access the BMS via BT+wifi modules and Comboard modules dedicated to older versions of BMS. And the problems began. BT+wifi modules work only in local BT mode. In remote wifi mode, the Smart BMS app shows the online connection, but no data is displayed.

After contacting Dalyc support, I received a suggestion to update the software to version 103_309_基版本(11_250808_001T).s19. The text 基版本 stands for "base version".

Does anyone have experience with updating such an old BMS, because I heard from Daly that they no longer have the original software. What stable and error-free software can be uploaded to this version of BMS? I ask just in case something goes wrong.

I expressed similar concerns about installing the latest software version because, as they put it, "it was a bit of a stretch for such an old building management system." I wanted to keep the version of the program I already had installed. Their response: "We can't find that file anymore; it's been there too long."

When I asked about security and the possibility of damaging the building automation system after installing the new software, their response was: "Our versions are constantly being improved and there's usually no risk involved." This aroused my suspicions. Hence this forum post.

After successfully connecting the WNT board to the BMS, I won't risk updating the BMS software just yet. Unless someone confirms that it's safe for this BMS model.