Unable to boot in SSD 1 with Cachyos after installing Cachyos in SSD 2

Issues & Assistance
1

I have 2 ssd’s with me. I installed Cachyos on SSD1, spent weeks setting it up with all my workspace requirements.
I wanted to have another cachy os on SSD2 for my dad, so plugged the pendrive and did the installation. I very carefully selected the SSD2 in the launcher, and very carefully selected the partition where I want it to get installed, installation went well.
But now I am unable to select SSD1 and boot into it, SSD2 has now becomes the only bootable device. SSD1 is not visible in the boot loader list anymore.
I used systemd (which is default) and btrfs if that’s relevant.

Suggestions please.
Thank you for your time.

2

Did you maybe overwrite the bootloader and did not used for the second ssd the “erase disk” option?

3

Hi, thanks for your response.
Yes I has 2 partitions in SSD 2, so I selected that and didn’t use “erase disk” option, and used “Replace a partition” option.

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