Kindle touch 5.1.2 update your kindle gray Solution

I had to go on a business trip, so I took out the old Kindle touch in the drawer and wanted to upgrade it. Baidu said that I had to pay more attention to the electricity and decisively unloaded the original version.

However, the update your kindle option in the native is gray. What should I do?

After trying for half a day, I found a solution and did not dare to enjoy it exclusively. The special post is as follows:

1. Press the shopping cart to enter the online store (Internet connection is required, preferably WiFi)

2. Wait until the shop is updated and upgrade again. Now you can press

Kindle touch 5.1.2 update your kindle gray Solution