Same error message here. I wonder if this might be an issue with the re-locker spl? Anyway, I extracted the .nbh file from the 2.17 upgrade .exe by using 7-zip and renamed it to TITAIMG.NBH. Copied that to the root of my microSD card then ran the bootloader by pressing power+camera buttons and poking the reset hole. It took quite a long time but eventually restored the 2.17 ROM. All I had to do after that was to restore my backup. I'll look forward to the eventual release ROM but this test version was simply too unstable for me.
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