Can't jailbreak PW3 Paperwhite 3 2015 what am I doing wrong?

Paperwhite 3 2015 what am I doing wrong?

Following the wiki https://wiki.mobileread.com/wiki/5_x_Jailbreak

Original Kindle firmware installed = 5.8.1

Step 1: Download PW3 factory_PW3_5.9.6.1_initial firmware
Step 2: # Home -> Menu -> Settings -> Menu -> Update Your Kindle # Confirm # Wait
Step 3: Transfer main-htmlviewer.tar.gz to main directory
Step 4: In search type ;installHtml
Step 5: Transfer Update_jailbreak_hotfix_1.16.N_install.bin
Step 6: # Home -> Menu -> Settings -> Menu -> Update Your Kindle # Confirm # Wait

Upon restart I cannot downgrade the firmware (I want to go back to 5.8.1)
It says Update Error An invalid update file has been loaded onto your device.

I cannot install KUAL-v2.7.21-g3928582-20190724 -> it never shows up in MY LIBRARY

What did I do wrong?
Thanks in advance for an helpful tips