Hi Robert:
I'm not sure if you've already read it, but the Hanlin V5 review thread started by Mneme has more info on the hyperlink issue with Jinke firmware and its limitations:
https://www.mobileread.com/forums/showthread.php?t=55228
Also, JSWolf indicated in this post that Sony readers do support internal hyperlinks:
https://www.mobileread.com/forums/sho...1&postcount=33