i used hwota8 with files from fullOTA from FF to install the update to 366 (march securtiy update). Obviously i needed to then reflash TWRP (now using FBE decrypted version: https://mega.nz/#!FWoG0CyT!PJlFxi65GJ18k5LdJz-TfoPjICKG0vwsnNKs0H5K6a4) and re-root... All is good and gladly didn't...