I just took delivery of one of these today. It came with 1.72 firmware (hardware revision B0 C0). I've sucessfully upgraded to 1.74, however every attempt to upgrade to wzrhpg300nh-pro-v24sp2-14998 has resulted in "Invalid firmware, rebooting!"
Just to cover all bases, I've:
- downloaded three times (sha1sum of the zip: 0c69b4b04e45a246c74d15bde6067629089a9a7b ; sha1sum of the firmware: 76b24c599f79cb0cb17e08f754b0954bf1ef0445)
- tried three browsers (IE8, FF 3.6.9, Chrome 6)
- cleared cache on all
- tried two pcs and one laptop
All were wired directly to the WHZ-HP-G300NH
Edit: I should mention that every attempt was made exactly as stated in the "howto_update_ap.html" included in the wzrhpg300nh-pro-v24sp2-14998.zip