Samsung S9 Plus Exynos Custom Rom -

Stock firmware had kept the phone awake constantly, polling for Samsung’s telemetry. Now, the Exynos modem was quiet. The only things running were the apps he chose. He calculated the idle drain: 0.3% per hour. On a four-year-old battery.

He leaned back. The S9 Plus was no longer Samsung's phone. It wasn't even a smartphone anymore. It was a platform . A piece of hardware liberated from its corporate shackles, running code written by strangers on the internet who believed that if you bought a device, you should own it completely. samsung s9 plus exynos custom rom

But there was a cost.

He nearly wept.

For two years, the S9 Plus had been a dutiful, boring servant. Android 10. One UI 2.5. The last official update from Samsung was a security patch from March 2021. The phone was a ghost of its former flagship self—fast enough, sure, but bloated with the "Smart Things" framework, Facebook services he never asked for, and a battery that drained like a sieve because the Exynos 9810’s custom Mongoose cores ran hot just checking the weather. Stock firmware had kept the phone awake constantly,

Deep sleep: 98% when idle.