You're kind of screwed .. unless you can fix the bd drive, you wont be able to update to 5.05. The BD drive shares a key written in nand so you cant replace it.
Well I don't know if the ps4 allows it but I am pretty sure you can change you BR drive if you keep your original br board since that's where your NAND KEY is stored.
BR Drives are a Pain in the ASS. They break so easilly.