if your firmware starts with B40 that's the copy version camera, you can generally install another B40 version firmware without too much problem, if you install an A118 version firmware you are likely to have stability problems as the hardware spec is different
if it's working now I'd advise against changing it, the hardware can change from production to production and there's no guarantee that newer B40 firmware will be matched to the hardware you have
for your A118 cam that one is ok to update if there's a newer version
i they are both the same unit b40 with capacitor ...start screen is has the same logo and colour as well is the menu but have write 2 different firmware numbers strange !!
The old B40 came from the original supplier, the buyers got greedy and wanted a cheaper version, the copy version has been around for about 8 months or so now