Many people (me included) have been complaining that 1.8.10 was problematic during the installation. The message on screen says the update is finished, but the update is not. The led on the gimbal shows it is still in progress. If anybody like me, being a newbie, believes the message and closes down, the upgrade fails. Other people complain that it sticks at 45%, while others report that the A/C starts to emit a LOUD noise like a siren.
Perhaps if you have managed to install 1.8.10 successfully, maybe because you ignored the finished message, then 01.07.0800 being a lower number isn't offered to you, but if you have a lower number firmware than 01.07.0800 installed, as was the case on my brand new P3S, then it will be.
So, perhaps it could be that 01.07.0800 is a fixed version of 1.8.10 which is substantially the same minus the installation script error which causes the Siren noise, sticking at 45%, finished message when it hasn't but given a lower number so that if you managed to install 1.8.10, then it doesn't concern you.
Either that or DJI is at it.