Originally Posted by gers1978
What happens if/when Amazon update it to 5.1.1? Will I lose the jailbreak?
Nobody knows what would happen, as the Amazon hasn't released the 5.1.1 over the air update yet. It could delete some files related to jailbreak. Or it could brick your Kindle (this often happens when updating with various patches enabled). You should uninstall all hacks before updating to new version.