I'm not sure you can update that way (from internal), as far as I know you must have a usb hard drive or thumb drive. Put the renamed file directly on the drive in: PS3/UPDATE folder. Create two folders via pc or multiman PS3 & UPDATE. Drop the UPDATE folder into the PS3 folder and put the renamed pup file into the UPDATE folder. Then update via xmb. Get a copy of Q/A TOGGLE and install that first as its supposed to help with downgrading back er something of the such. I hear its good to do anyway but not necessary. I did it on mine this way and no problems. Good luck and post back with results. Its a simple process that takes only a few minutes. I've updates several times and not had problems yet.
Edit: if you have blank cd/dvd/bluray media I think it would probably work to burn the file structure with the update onto a disc and update as I've read everywhere that you must not have a game in your console when updating as the update will come from the disc before the external media. Oh btw, make sure you don't have a game in your console when you update or you may end up in a real situation on unhackable ofw that can only be hacked with expensive hardware and plenty of knowhow (or a downgrading service which you will have to send your ps3 to someone else to do, such as user: racer0018 provides here on this site). Cheers.
CECH-2001A 120g, Rogero 4.21v1.09
CECH-A01 250g, cobra 4.30+Cobra Dongle<--YLOD 4/17/13