I just configured a DHCP server for a HOTSPOT, but it assigns the IP addresses in descending order, I mean from x.x.x.254-- x.x.x.253-- x.x.x.252, how do I assign the IP addresses in ascending order, that is; x.x.x.2-- x.x.x.3-- x.x.x.4 and so on

You can't force the order which DHCP server uses to assign addresses.

And, honestly, it doesn't matter at all, all IP addresses (within certain range) are equal, they are dynamic after all. If you want to set some certain address to certain device(s), then you can always set that particular DHCP lease as "static" (and optionally edit the address ... in which case DHCP client device will change its IP address after it renews the DHCP lease which can not be forced from DHCP server side).