Oppo is rolling out a new software update for the Oppo K1 and Oppo K3. The latest update brings the April 2020 security patch and a few other stability improvements.
The latest update comes with software version A.11 and C.35 for the Oppo K3 and Oppo K1 respectively. Oppo is currently running ColorOS 7 beta program for the Oppo K3.
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If you want to check for the update manually, just head into the device Settings tap on the Software updates.