[Galaxy S 4 i9505 Original Android Development] side:
Optimized LineageOS 18.1

brought to you by the Jflte DevConnection Team

⚠️ DISCLAIMER ⚠️

Your warranty is now void.

We are not responsible for bricked devices, dead SD cards, thermonuclear war, or you getting fired because the alarm app failed.

Please do some research if you have any concerns about features included in this ROM before flashing!

YOU are choosing to make these modifications and if, YOU point the finger at us for messing up your device, WE will laugh at you.​

FEATURES 💫

Based on Official LineageOS 18.1 - Android 11

Latest Security Updates integrated

Improved Speed, Stability, RAM usage & Battery drain

Powered by Buffcore Kernel - some / most / all of the following may or may not be hooked up yet.

Many, many more - install and see for yourself!;)

Buffcore 10

set config_hz to 300

add intelliplug

tweak our touch boost

add color control tweak

stop lowclocks from defconfig

build with gzip

quickwakeup - the kernel can semi-wakeup and decide if needs to end suspend or return to suspend with losing

doze

fully optimized toolchain flags

reduced sleep timeout

dynamic file syncing - early_suspend and dyn_fsync by default

print to dmesg log when a suspend gets broken

sdfat enabled

fastcharge implemented (up to 1900 ac / 1600 usb)

bcmhd wakelocks for rx and tx halved

libmemcopy and libstring sped up

io readahead to 1024k

power efficient work queues

voltage tweaking user interface

faster vmstat

autosmp hotplugging replacement

mmc crc disabled

allow for lower cpu voltage

reduce swapiness

optimize divide / multiply by power of 2

added tcp optimization options

set westwood default

optimize cbfillrect function

reduce wifi wakelock times

nohz: reduce overhead under high-freq idling patterns

SUPPORTED DEVICES 📱

GT-I9505 (jfltexx)

GT-I9505G (jgedlte)

GT-i9507 (jtfddxx)

GT-i9508 (jfltezm)

SCH-I545 (jfltevzw) VERIZON USERS: since your Bootloader is locked, you must be on the VRUAMDK

SCH-I545L (jfltelra)

SCH-R970 (jflteusc)

SCH-R970C (jfltecri)

SCH-R970X (jfltecsp)

SGH-I337 (jflteatt) AT&T USERS: since your Bootloader is locked, you must be on the UCUAMDB or UCUAMDL

SGH-I337M (jftlecan)

SGH-l337Z (jfltecri)

SGH-M919 (jfltemo)

SGH-S970G (TracFone / Straight Talk)

SM-S975L (TracFone / Straight Talk)

SPH-L720 (jfltespr)

SPH-l720T (jflterefreshspr)

jfltezm - China Mobile

jfltetfnatt

jfltetfntmo

Do 'getprop ro.bootloader' in Terminal Emulator or through ADB shell to find out which Bootloader you have.

DOWNLOADS ⏬

Optmized LineageOS 18.1: Google Drive

GApps: Open GApps / Open GApps A11 (Test Builds) or BitGApps or MindTheGApps

Official TWRP Recovery: HERE

JDCTeam TWRP Recovery: HERE

TWRP Recovery Loki Patched: HERE

Magisk: HERE

GAPPS 🤖

You can use Pico or Nano Open GApps / Open GApps A11 (Test Build) or BitGApps or MindTheGApps

Be sure you have selected Platform: ARM and the proper Android version of the ROM you are going to flash. If the ROM you want to flash include GApps, no need to download and flash any GApps at all.

TWRP 🛠️

You can use either the latest and recommended Official TWRP Recovery or JDCTeam Recovery to flash the ROM.

If you have a variant with a locked but exploitable Bootloader like AT&T and Verizon then use the TWRP Recovery Locki Patched by mattgyver.

SAMSUNG GALAXY S4 UNIFIED GUIDES & COLLECTION 👨‍🏫

You can follow the well-explained steps to install a ROM, find and download the latest Bootloader & Modem for your variant from the S4 Unified Guides & Collection thread by Retrial.

JDCTEAM UNIVERSE 🪐

You can find the total work of JDCTeam over the years HERE.

SOURCE CODE 👨‍💻

Avaible at JDCTeam GitHub

CREDITS 🏅

Side - Lead Developer / The Boss

Buff99 - Minor Developer / Major Meddler

JDC Team

LineageOS

OpenGapps

JDCTeam 🪐

Buff - Buff99

Chibbo - Chibbo

Creeper - Creeper36

Diego Monaco - alucard_24

Dimitris Katikaridis - side

Franck Rohée - franzyroy

George Mantratzis - Retrial

Ray Daley - gadget!

Jim Silverlock - Jsilver73

Marco Zanin - -+BB+-

Matthew Booth - MattBooth

Mattia D'Alleva - AntaresOne

Mike Atkins - FernBch

Oliver - angelcalibur

Paul Harris - hawkerpaul

Paul Keith - javelinanddart

SalimPS - SalimPS

Simeon Ivanov - smstiv

Stefano Meroni - smeroni68

Yannis Menexes - SkL*

Vasileios Moisiadis - vmroot

You are welcome to join the Official JDC Team chat/test group in Slack 🗣️​