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If you follow the second tutorial you don't need to boot into DSM, boot into a live Ubuntu USB & delete the system partitions then reinstall whichever DSM version you want.

The forum search is always a good place to start, however have a look at these threads.

@asaf If you're happy with the answers above I'll close the thread.

3615 is generally more stable on a wider variety of hardware.

Try booting from a live Ubunto USB.

The one that most people with Gen7 microservers seem to use is the HP NC360T. Don't forget that you'll need to disable the onboard NIC & DS3615XS image is recommended as it seems to be the most stable.

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Have you flashed the bios to enable AHCI mode on the 5th sata port?

Some information regarding what hardware you're using might help you get some answers.

You can run DSM 6.2 on the N40L with jun's 1.03b loader, but you'll need to get a compatible intel lan card. Several forum members have had success using a HP NC360T nic. If you search the forums there are a couple of threads that would be worth checking out.

@maconly34 @le.pipo007 This is an English speaking forum, please post in the appropriate language in future.

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You're correct that you won't have warranty anymore but they should still be able to offer advice & possibly diagnose the issue.

@hannmuell As you have a genuine Synology device it maybe worth looking through the Synology forums or even contacting Synology support for advice.