You may have to re-flash the unlocked version of bios. Look for the How to Unlock Bio tread posted by Giovanni.
Be careful. Choose the right version (by date). I upgraded my ezbook pro v4.
V4 has an access “door” to install m.2 ssd, on the bottom of the laptop.
This is on the US eBay site. I’ve bought two. The seller accepted my $45 each offer price. It is made by Intel for its server line. HP re-labels it.
https://www.ebay.com/itm/NEW-HP-SSDSCKHB340G401-340GB-6G-SATA-Read-Intensive-M-2-2280-SSD-H48701-200/192417055828?hash=item2cccf34454:g:CesAAOSwTO9aTTlb
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