How to block some browsers VERSIONS from accessing my website?

[webtechnical]

Getting a huge number of hits from these browsers. How to set a challenge or block them ?

Thanks!

[sdayman]

You can try this Firewall Rule, but you might very well impede many legitimate visitors:

(replace the xxx with the portion of the version number you wish to challenge or block)

[webtechnical]

Thanks! It works.

How about operating systems? how to set a firewall for android / iOS / tablet users?