HDD Caddy & Acer Aspire 7741G (system not booting)

[Pleistoros]

I decided to install a SDD in my Laptop and keeping the original hard drive.
(removing the blue ray drive from laptop and installing the Caddy)
After installing the Caddy I discovered that the two hard drives will not work together, the laptop freezes and I cant access the BIOS to identify the status.

Independently the hard drivers are working fine, as a single drive, either in laptop bay or in caddy.

After doing some research, all is pointing to a Caddy compatibility, but both drivers are working fine if they are used as a single drive installed in that Caddy.

I still have the original BIOS on the laptop (v1.04), and after reading the info on all new releases (up to v1.26), there are no specification regarding fixing a problem regarding a second HDD or Caddy bay.
Since there are some problems with flashing other Acer models and I didn't found some relevant data regarding my model, I don't want to do a BIOS update unless is absolute necessary (because the Laptop is working fine and has no problems at all).

Thanks in advance !

Laptop model : Acer Aspire 7741G - 434G50BN
Caddy model : Akasa AK-OA2SSA-BKV2
Original HDD : WDC WD5000BEVT-22A0RT0 (500GB)
New HDD : Intel SSD 530 series (240GB)

 

[Pleistoros]

Anyone has an idea what slow this is ? and if is PCIe, can be used with msata ?