EDIT:
I went for it and installed the intermediary then the latest, gave an error. I installed the last link (R10), then to R14, and it worked. Thank you!
Original:
Understood. To clarify, I should still follow the steps outlined in the OP? I had no issues installing the closed beta firmware R13. Just making sure I'm following the right steps from closed beta R13 -> R14 open beta version.
Intermediary firmware first.
https://www.dropbox.com/s/hpeb2w2m4mvmv3q/INTERMEDIARY_FIRMWARE.img?dl=0
Then the latest firmware.
https://www.dropbox.com/s/n5nk0fxkhzosvp2/XR500-V2.3.2.134-dumaos33-rc14.img?dl=0
If issues, use that last link in the OP. Right?