/en/qa/tag/07-jeep-grand-cherokee Powered by Question2Answer /en/qa/75375/will-the-evo-chrt5-need-to-be-updated-with-firmware-when-received Rececently bought the evo chrt5 for my 07 jeep grand Cherokee. Connected the yellow wire from the t-harness to the yellow on the 20 pin connector, and the purple from the t-harness to the green/red on the 20 pin, installed the unit correctly to the immobilizer, went through the light sequence and synced the OEM key by hitting lock x1 when blue flashes. Pressing lock 3 times will not start the vehicle. And I do get the yellow light when the key is in run position. Jeep /en/qa/75375/will-the-evo-chrt5-need-to-be-updated-with-firmware-when-received Tue, 27 Dec 2016 12:59:36 +0000