Which firmware adds WDR mode to backlight options dropdown (IPC-HDW5231RP-Z )?

Mr_D

Getting comfortable
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I purchased a IPC-HDW5231RP-Z from Andy about a year ago which has firmware 2.460.0000.15R dated 2017-09-07. I noticed my latest purchase of a IPC-HDW4231EMP-AS fixed starlight has firmware 2.800.000000.0R dated 2018-12-26 which now includes a WDC option under backlight control. This mode seems to preserve contrast better than the BLC mode present in my other cameras.

I'd like to download a STABLE firmware that includes this function. I've looked through various firmware threads (didn't find anything for 2018-12-26) and I'm scared to brick my cameras, especially the ones that are mounted. Is there a consensus on what firmware is stable? Otherwise, I'd like to get the one that came on my latest camera since it seems OK in bench testing. Do 5231 and 4231 cams use the same firmware?
 
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