How to update to OS7 beta for evaluation. (N2800, N4800ECO, N5550 and N7510)
1. Update to latest OS5 X64 V2.05.12.3 and reboot.
http://www.thecus.com/Downloads/beta/FW/Thecus_x86_64_FW.2.05.12.3.cdv_build88850_N2800_N4510U_N4800_N5550_N7510.rom
2. Please download OS5 CONF.BIN as a configure backup from [system management -> config mgmt. -> DOWNLOAD].
3. Update to latest OS7 beat and reboot NAS.
https://mega.nz/#!4Y4iFLBD!BC9W1Y2f1GsSSQfvSQreQFUNh-Rb7H1SIzfnYYDYjZU
2016/01/06 22:28 143,809,376 Thecus_x86_64_FW.3.00.01.cdv_build9063
4. If went OS7 roll back to OS5, please refere to following FAQ:
http://thecus.kayako.com/default_import/Knowledgebase/Article/View/642/0/how-os7-roll-back-to-os5
5. Since roll back to OS5, please upload saved CONF.BIN file make OS5 configuration back from [system management -> config mgmt. -> UPLOAD] & reboot.