I don't see a downgrader for that clone dongle. It isn't officially supported by the psjb team as it is a knock off. What type of file do you use to update it with? As you have to flash it with the downgrade app before you can use the pup file as the dongle is what puts it into service mode not the dongle. And unless they made a downgrader which I doubt you will need other means to downgrade.
PS3 CECH-2501A [CFW] & CECH-3001 [OFW]/ PS2 SCPH-3901 & SCPH-7501/ PS1 SCPH-5501
Mod Cobra 4.46 v7.00 w/ E3 Flasher [CFW] & Cobra ODE 4.50 [OFW]/ Mod HDD-OSD [Phat] & Modbo 4.0 [Slim]/ Mod MM3
HDD 1tb [CFW] & 640gb [OFW]/ HDD 640gb & OPL v0.92 w/ 1.5tb SMB