From Some v3.4 upgrade notes
Upgrading from v2.0 or higher — If your Snap Server is running SnapOS version 2.0 or higher, see the upgrading to v3.4.x instructions.
Upgrading from earlier versions — If your Snap Server is running SnapOS v 1.x, you must perform two upgrade procedures: (1) Upgrade to v2.0 using the upgrading from v1.x to v2.0 instructions; and, (2) Once the 2.0 upgrade has been performed successfully, upgrade your Snap Server again using the upgrading to v3.4.x instructions.
So you will need to lose all your files as the hd format changes
Caution Do not downgrade a Snap Server from v3.4.x to v2.x
There is a change in the disk format between Snap Server v3.4.x and v2.x. The disk format change is handled automatically, so it is safe to upgrade to v3.4.x. However, once the disk format is upgraded to v3.4.x, you cannot revert to any earlier version of the SnapOS. The older software will not recognize the new disk format. As a result it may reconfigure your drives and cause data loss.
Visit the snap appliance .com website and click on product registration, download v3.4 and the other info from there and then you can upgrade to v4 if needs be after
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