Not all firmware is universal. The Yt5760b may have hardware revisions (V1.0, V1.1, etc.). Installing firmware intended for a different hardware revision can cause irreversible damage. Check the sticker on the bottom of your unit or the system information menu to confirm the exact model number.
: Before updating, it is wise to take a photo of your existing Factory Settings (often accessed with passcode Yt5760b Firmware Update High Quality