hp probook450 G4 can i replace keyboard with back-lit keyboard?

Solution
I don't have a definitive answer to your question. But I just read a review of the most expensive configuration of the ProBook 450 G4, and it didn't have a backlit keyboard. I would assume that none of them probably include one if the most expensive model doesn't. So my best guess is that the 450 G4 series doesn't support backlit keyboards.

EDIT:
After further investigation, the service manual parts list shows both backlit and non backlit keyboards. So it might be worth a try:
http://h10032.www1.hp.com/ctg/Manual/c05270979

Under "Product Description" on page 4, both types are mentioned. And on page 13, a description of a particular hotkey being pressed in conjunction with the Fn key toggles the backlight on and off. Parts list is on...
I don't have a definitive answer to your question. But I just read a review of the most expensive configuration of the ProBook 450 G4, and it didn't have a backlit keyboard. I would assume that none of them probably include one if the most expensive model doesn't. So my best guess is that the 450 G4 series doesn't support backlit keyboards.

EDIT:
After further investigation, the service manual parts list shows both backlit and non backlit keyboards. So it might be worth a try:
http://h10032.www1.hp.com/ctg/Manual/c05270979

Under "Product Description" on page 4, both types are mentioned. And on page 13, a description of a particular hotkey being pressed in conjunction with the Fn key toggles the backlight on and off. Parts list is on page 17. Page 45 shows country codes for ordering the correct language keyboard, and the removal procedure is covered after that list.
 
Solution