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Visit https://taig9.com/12.4/ using safari browser.
Find Install Dedao button and tap on it.
Tap Allow as shown in the image.
Go to Settings --> Profile Downloaded
Tap on Install button in the top right corner.
Now you have successfully installed Taig Dedao
You can get latest iOS beta versions without Apple developer account from TaigOne beta installer.
Downgrade iOS with TaigOne iOS Downgrader.
Tiqu is a jailbreak repo extractor. Now you can get it from TaigOne.