Since the PW-1 devices are **not yet** running a 5.6.x series firmware -
The "rename as a directory" trick will still work to block the download.
Right, since somebody is certain to ask, here you go:
https://www.mobileread.com/forums/sho...41&postcount=3
(Which can also be found in the FGA thread.)
It is only the 5.6.x series which can defeat that blocking tactic.
(And 5.6.x series can defeat all but the most recent release of the Backdoor Lock)