http://bgr.com/2016/06/02/how-to-make-iphone-faster/

Kindle Fire HDX 8.9″ (2013 3rd Generation)

Model GU045RW

Helpful info

• Manufacturer’s Device Home Page
• Basic Device Information
• Official Stock Firmware
• Device Tools, Root/Un-root/Un-brick methods
• Custom ROMs
• Kernels & Radios
• MODS, GUIDES, and Misc

http://forum.xda-developers.com/kindle-fire-hdx/general/index-kindle-fire-hdx-7-8-9-t3206703

Stock firmwares for Kindle Fire HDX

Fire OS 4.5.5 “Sangria” based on KitKat 4.4.3 build

http://forum.xda-developers.com/kindle-fire-hdx/general/update-1314-4-1-1-probably-sangria-t2901813

(this link includes previous firmware versions)

This video explains how to run Speedfan at startup:

http://www.computerninja.com/2015/01/getting-speedfan-start-windows-78-x/

Also, the Automatic Fan Speed option checkbox on the main window and the Automatically Variated option checkbox on the Configure\Speeds\Pwm1 section need to be checked/enabled.

See here for an article which shows you how to do this.

Here are some codes you can dial into the phone app that will access hidden information and menus in the iPhone:

*#06# – Displays IMEI

*3001#12345#* + “Call” – Accesses a hidden Field Test menu

*#43# + “Call” – Displays call waiting status

*43# + “Call” – Enables call waiting

#43# + “Call” – Disables call waiting

*#21# – Displays call forwarding status

##002# + “Call” – Disables all call forwarding

*33*pin# – Enables call barring

#33*pin# – Disables call barring

#31#phone-number + “Call” – Blocks caller ID for the current phone call

*3370# + “Call” – Enables “Enhanced Full Rate” and improves voice quality on GSM networks (may impact battery life)

*#5005*7672# + “Call” – Displays your carrier’s message center phone number