how to put an old software version back on edge 1040

hello
"Due to the 24.54 / 25.24 / 25.25 change of the 1040 file structure from "mass storage" to "MTP" (Media Transfer Protocol) and the change of the version update file format/type from "GUPDATE.GCD" to "GUPDATE.GSP", a return to older software may not be possible anymore."
and if I rename the gcd to gsp? can it work?, has anyone tried it yet?
thanks