Three beeps usually indicate that the USB boot system has started successfully. Please search for the NAS using the TNAS PC app or access the NAS directly via 'tnas.local/'.
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?
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)
- ShinyNobody
- Posts: 6
- Joined: 12 Nov 2025, 01:31

Re: How to Flash a New USB Initboot for TOS on Windows PC?
Thank you that was it.
- ameliarosewood898
- Posts: 1
- Joined: 07 Dec 2025, 02:52

Re: How to Flash a New USB Initboot for TOS on Windows PC?
Here’s a concise, step-by-step guide:
Download the TOS USB Initboot image from the official source.
Insert your USB drive into the Windows PC.
Use a flashing tool like Rufus or BalenaEtcher.
Select the USB drive in the tool.
Choose the TOS Initboot image file.
Start the flash process and wait until it completes.
Safely eject the USB drive.
Download the TOS USB Initboot image from the official source.
Insert your USB drive into the Windows PC.
Use a flashing tool like Rufus or BalenaEtcher.
Select the USB drive in the tool.
Choose the TOS Initboot image file.
Start the flash process and wait until it completes.
Safely eject the USB drive.
Re: Как прошить новый USB Initboot для TOS на ПК с Windows?
Can you please tell me if USB Initboot Image (TOS 6 uefi 120MB) is suitable for Terramaster F4-425 Plus?
Re: Как прошить новый USB Initboot для TOS на ПК с Windows?
Yes, this image file is also applicable to the F4-425 Plus.
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: Как прошить новый USB Initboot для TOS на ПК с Windows?
Can I do this?
Code: Select all
TNAS-425-Plus:/Volume1/public# fdisk -l
Disk /dev/sda: 251.5 MiB, 263716864 bytes, 515072 sectors
Disk model: TerraMaster
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
TNAS-425-Plus:/Volume1/public# dd if=USB_Initboot_UEFI-229.img of=/dev/sda
245760+0 records in
245760+0 records out
125829120 bytes (126 MB, 120 MiB) copied, 34.5695 s, 3.6 MB/sI did so and it didn't help, the TOS initialization does not load and the BIOS does not see the boot disk when there is no disk.
Please help me restore the loader on F4-425 Plus
Re: How to Flash a New USB Initboot for TOS on Windows PC?
I repeated everything again and this time I was able to download F4-425 Plus without disks. But now he doesn't see the network. Perhaps there is still no network driver for 5Gbe in this loader and I need another loader.
Re: How to Flash a New USB Initboot for TOS on Windows PC?
A USB boot disk image suitable for your NAS model has been added to the first page of the topic. Please try again.
viewtopic.php?t=6433
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?
Thank you, everything worked out!!!TMzethar wrote: ↑10 Dec 2025, 20:11A USB boot disk image suitable for your NAS model has been added to the first page of the topic. Please try again.
viewtopic.php?t=6433
Re: How to Flash a New USB Initboot for TOS on Windows PC?
Is there a USB initBoot image for TOS7?


