Skoda octavia 2 1.4 TSI - ABS failure and replacement

Hello, i have a skoda octavia 2 1.4 tsi 2009 after a couple of weeks investigating the issue on my skoda, after a few mechanics and a trip to the dealership, the final response was that my abs unit broke down. 

I tried to ask the dealership for some compatible codes for the unit but they didn't give me anything. Now i have the money to replace it with a second hand one ( new is around 2000 euros from the dealership) and my problem is that i don't know what type of unit to buy. Someone told me to get a pump with the following code 1K0 614 517 AT and controller 1K0 907 379 AJ because they have compatibility with my cars equipment (cruise control, hill assist). What do you think about this pump/controller and if you can tell me some codes that are compatible in case these don't work i would really appreciate it. From what i've read online some cars were called back to the dealership in 2017 for a software upgrade regarding the abs unit or a total replacement of the unit. According to the dealership the car had a software upgrade in 2018 but the unit broke down. I have to mention that i bought this car 2 months ago.  

I need some advice please, maybe some of you went through this already, i don't need to keep changing abs units.

Thank you for all your answers!