No bootable drive after installation

[jury]

I have an old notebook (Dell Inspiron 3521) which I decided to revive. It got additional 4GB of RAM (now 8GB) and I switched HDD with 240GB SSD. It should be quite usable now.
So I have installed Haiku without problems. But when I try to run it just gives a message about no bootable drive.
I found this topic:

Installed Haiku, finds no bootable drive

Hi. My Name is Pascal, I am from Switzerland and stumbled upon Haiku today. I found it a good mix to have a High-End Windows 11 PC, a Linus Mint low-end PC, and an old PC with Haiku. The PC is a Pentium 4 3.067GHZ (First CPU with Hyperthreading!) with Radeon X1950 Pro 512MB GPU,1 GB RAM, and an old 200 GB HDD. I burnt an ISO of Haiku to a DVD-R and booted the Pentium 4 with it, the installer loaded, and I formatted the HDD and did run the installer. However, upon rebooting, no bootable drive w…

so I tried what @nephele suggested there (even thou I created the partition from scratch in the haiku installer) marking Tools-> Write boot sector at the end of the installation. The other thing mentioned by @nephele (marking it as active) I did not do, as I could not find this option anywhere.

Above tries were done with BIOS/UEFI set as Legacy (and in this mode this notebook worked in 3 different Linux distributions over those 11 years of its existance, I wiped out Windows the same day I bought the machine) So I changed setting to UEFI, but then after installation it just gives “Unknown device” 2 times and halts.

How can I boot Haiku, preferably in Legacy mode, but if UEFI is the only option, let it be.

[nephele]

You don’t ever need “write boot sector” If you created the partition table yourself. This is only neccesary if you do something wierd like keeping a partition table and at the same time replace a bootloader like grub that uses a non-standard mbr.

You do however need to set the partition as active.

Check the “creating a partition” section:

DriveSetup

[jury]

Haiku boots!
Thank you.