Solution 12215: Exchanges or Upgrades of TI Graphing Calculators.
...s family, TI-84 Plus family and TI-89 family, can be upgraded electronically with the TI Connect™ software. The OS on TI-Nspire™ and TI-Nspire CAS Handhelds, can be upgraded electronically. Please see additional updating instructions for TI-Nspire family handhelds and software TI-Nspire™ Family D...https://education.ti.com/en/customer-support/knowledge-base/ti-83-84-plus-family/warranty-replacement-options/12215
Solution 11793: Unable to Graph Multiple Functions on the TI-83 Plus Family and TI-84 Plus Family Graphing Calculators.
...itor should return to the normal display. Please see the TI-83 Plus Family and TI-84 Plus Family guidebooks for additional information. TI-Nspire handheld in TI-84 Plus mode users may refer to the TI-84 Plus family guidebook. Solution 11793: Unable to Graph Multiple Functions on the TI-83 Plus...https://education.ti.com/en/customer-support/knowledge-base/ti-83-84-plus-family/product-usage/11793
Solution 11691: Adjusting the Contrast on a TI Graphing Calculator.
...st the contrast of the screen. To adjust the contrast on a TI-73 Explorer™, TI-80, TI-81, TI-82, TI-83 family, TI-84 Plus family, or TI-Nspire™ handheld in TI-84 Plus mode, TI-85 or TI-86: 1) Press and release [ON]. 2) Press and release [2nd]. 3) Press and hold the down arrow (to lighten) or...https://education.ti.com/en/customer-support/knowledge-base/ti-83-84-plus-family/product-usage/11691