That's good to know! Is there a possibility to reflash it, in case it gets corrupted (or overwritten by third-party operating systems)?Gremlin wrote: ↑24 Jun 2026, 14:31 -425 models do not use the traditional plug-in usb flash drive. They use a daughter-board flash card mounted on the motherboard (USB-DOM).Code: Select all
What it Does in Your F4-425The Hardware: It is a tiny, proprietary daughter board attached to an internal USB header via a standoff and secured with a single screw. The Function: It contains a small amount of flash memory (historically 1GB–4GB, but updated to a compact ~250MB Flashdisc in the 425-series). Its sole purpose is to store the lightweight initboot / bootloader for TerraMaster's TOS operating system.
How to Flash a New USB Initboot for TOS on Windows PC?
Re: How to Flash a New USB Initboot for TOS on Windows PC?
F4-425 PLUS on TOS 7.0.0517 Beta (X86)
Re: How to Flash a New USB Initboot for TOS on Windows PC?
Standard mainboard USB plug (varieties available on-line) - Picture here:
viewtopic.php?p=55280&hilit=usb+dom#p55280
F5-221 TOS7.0.0777 - 4x4TB (Ironwolf) Traid
F2-424 TOS7.0.0777 - 2x500GB nvme (P3) Traid, 2x6TB HDD (HGST) Traid
F2-221 TOS7.0.0777 - 1x3TB Ext4, 1x4TB Btrfs
F2-425+ TOS7.0.0777 - 2x500GB nvme (P3) Traid, 2x6TB HDD (EXOS) Traid
F2-424 TOS7.0.0777 - 2x500GB nvme (P3) Traid, 2x6TB HDD (HGST) Traid
F2-221 TOS7.0.0777 - 1x3TB Ext4, 1x4TB Btrfs
F2-425+ TOS7.0.0777 - 2x500GB nvme (P3) Traid, 2x6TB HDD (EXOS) Traid
Re: How to Flash a New USB Initboot for TOS on Windows PC?
Great! This should be much more reliable. Is there an image avaliable to download, if this module was overwritten?Gremlin wrote: ↑24 Jun 2026, 16:41Standard mainboard USB plug (varieties available on-line) - Picture here:
viewtopic.php?p=55280&hilit=usb+dom#p55280
F4-425 PLUS on TOS 7.0.0517 Beta (X86)
Re: How to Flash a New USB Initboot for TOS on Windows PC?
You may download image from the link: https://download3.terra-master.com/TOS% ... ot_1.3.img
To contact our team, please send email to following addresses, remember to replace (at) with @
Technical team: support(at)terra-master.com(for technical support)
Service team: service(at)terra-master.com(for purchasing, return, replacement, RMA service)
Technical team: support(at)terra-master.com(for technical support)
Service team: service(at)terra-master.com(for purchasing, return, replacement, RMA service)
Re: How to Flash a New USB Initboot for TOS on Windows PC?
That posted file link appears to be the same file as linked in the original post in this thread - ie Tos 6 UEFI 150MB
I don't know if that will use Tos7 as a default, given that on-line update from 6 -> 7 is not yet available. Maybe a Tos7 version will be made available in due course.
F5-221 TOS7.0.0777 - 4x4TB (Ironwolf) Traid
F2-424 TOS7.0.0777 - 2x500GB nvme (P3) Traid, 2x6TB HDD (HGST) Traid
F2-221 TOS7.0.0777 - 1x3TB Ext4, 1x4TB Btrfs
F2-425+ TOS7.0.0777 - 2x500GB nvme (P3) Traid, 2x6TB HDD (EXOS) Traid
F2-424 TOS7.0.0777 - 2x500GB nvme (P3) Traid, 2x6TB HDD (HGST) Traid
F2-221 TOS7.0.0777 - 1x3TB Ext4, 1x4TB Btrfs
F2-425+ TOS7.0.0777 - 2x500GB nvme (P3) Traid, 2x6TB HDD (EXOS) Traid
Re: How to Flash a New USB Initboot for TOS on Windows PC?
Hello, Is there a new initboot image for TOS7 yet?
Re: How to Flash a New USB Initboot for TOS on Windows PC?
Not public for now.
If you need it, please check your private messages on the forum. I've sent it to you there.
To contact our team, please send email to following addresses, remember to replace (at) with @:
Technical team: support(at)terra-master.com (for technical support)
Service team: service(at)terra-master.com (for purchasing, return, replacement, RMA service)
Technical team: support(at)terra-master.com (for technical support)
Service team: service(at)terra-master.com (for purchasing, return, replacement, RMA service)


