TerraMaster Forum

Applicable Models:
F2-223, F2-423, F4-223, F4-423, T6-423, T9-423, T12-423,
U4-423, U8-423, U12-423

Issue Description:
The TOS system is installed only on an M.2 NVMe SSD.
After updating from TOS 6 to TOS 7, the system returns to the installation page, or upon logging into TOS, an error message appears indicating a kernel version loading failure.

Root Cause:
During startup, the system booted from a USB drive first, instead of booting from the M.2 NVMe SSD containing TOS 7, causing the kernel from the USB drive's bootloader to be loaded.

Solution:
Method A: Migrate the System Disk.
1. Go to the Disk section within Storage Manager in the TOS Control Panel. In the System Disk function, edit the system disk and migrate it from the M.2 NVMe SSD to a SATA HDD or SATA SSD.
2. Update to TOS 7.

Note:
If you intend to install TOS 7 on an M.2 NVMe SSD in the future, you will still need to refer to Method B to adjust the boot order; otherwise, you may encounter boot issues.
If your TOS 7 will only be installed on a SATA SSD or SATA HDD, you do not need to update the BIOS or adjust the boot order.

Method B: Adjust the BIOS Boot Order.
1. Check the BIOS Version.
Power off the TNAS and remove all disks. Connect the TNAS using an HDMI cable and a keyboard. Press the power button, and then immediately and repeatedly tap the Del or Esc key multiple times in short, quick succession until you enter the BIOS interface. Do not hold the key down; instead, press it at a frequency of 1-2 times per second. On the main page, check if the Project Version is one of the following:
T1509BG0, T1509BF2, T7309A13

If it is not, proceed to Step 2 to update the BIOS.
If it is, go directly to Step 3 to adjust the boot order.

2. Update the BIOS version.
For older BIOS versions, follow the method below to update the BIOS:

3. Adjust the boot order.
In the BIOS, press the right arrow (→ )key to navigate to the Boot page, then press the down arrow (↓) key to switch to Boot Option #2.

Press the Enter key, then press the down arrow (↓) key to select NVME, and press the Enter key again to confirm the selection.



4. Save and Exit.
After selecting NVME, press F4. When the "Save and exit?" dialog box pops up, press the Enter key. You will then be able to boot into TOS 6 and proceed to update to TOS 7.

What if BOTH (NVMe and SATA) are appearing as system disk?

NVME will be displayed as NVME:
HDD will display as Hard Disk:

Schnorra wrote: ↑22 Dec 2025, 16:36 What if BOTH (NVMe and SATA) are appearing as system disk?

This would imply raid across both nvme and SATA drives which is really not recommended. Either setup O/S on a single drive or (t)raid 2 similar drives.

How exactly do I update the BIOS on an F4-423? The instructions say:

If it is, go directly to Step 3 to adjust the boot order.

2. Update the BIOS version.
For older BIOS versions, follow the method below to update the BIOS:

but then there is NOTHING below step 2 indicating how to actually update the BIOS. My project is T1509BH1, Thanks


FYI, you can find the instructions and link here: https://forum.terra-master.com/cn/viewt ... =91&t=3119

computerguru79 wrote: ↑03 Feb 2026, 11:08

It seems you sent a link to a Chinese forum. You can refer to this post on the English forum to update the BIOS: viewtopic.php?t=4238

TMnight wrote: ↑22 Dec 2025, 18:25 NVME will be displayed as NVME:
HDD will display as Hard Disk:

Cheers, I sorted it going int the BIOS and changing order, Upgraded to TOS7 no problem, BUT all my SMB/share permissions are borked and now all my media streaming libraries are broken and the don't appear in the browse to path windows..!!!

Schnorra wrote: ↑20 Jul 2026, 17:19

Cheers, I sorted it going int the BIOS and changing order, Upgraded to TOS7 no problem, BUT all my SMB/share permissions are borked and now all my media streaming libraries are broken and the don't appear in the browse to path windows..!!!
[/quote]
Following an upgrade to TOS 7, a permission conversion procedure may be required. If this conversion has not been carried out, we recommend that you reconfigure the applicable permissions as needed.

I am planning to buy a F2-223 and put a 256GB nvme m.2 on it and install TOS 7, do i have to change the bios setting after I installed the brand new unformatted nvme m2 on the brand new F2-223? By the way there will be no sata HDD or SSD in F2-223 only a nvme m.2 256gb.

apvm wrote: ↑10 Aug 2026, 07:55

Yes, if you plan to install TOS7 on an M.2 NVMe SSD in the future, please follow Method B to adjust the boot order to ensure proper boot behavior. Thank you for your understanding.