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How to Fix Bootloop — LG Optimus LTE SU640
How to Fix Bootloop — LG Optimus LTE SU640
The LG Optimus LTE SU640 is a 2011 Android 2.3.5 smartphone powered by the Qualcomm MSM8660 Snapdragon S3 with 1GB and 4GB internal storage. It features a 4.5", HD-IPS LCD, 720.0x1280.0 display and is available in Black, White.
The Optimus LTE SU640 is equipped with a Removable Li-Ion 1830 mAh battery, a 8 MP, 1080p@30fps main camera, a 3 MP front camera. The device uses a Mini-SIM configuration. It weighs 135 g.
A bootloop on the LG Optimus LTE SU640 occurs when the device repeatedly restarts without fully loading Android. This is commonly caused by a failed software update, corrupted system files, or an incompatible app. Most bootloops can be resolved without losing data by clearing the cache partition first before attempting a factory reset.
Factory reset may be needed as a last resort — erases all data.
On your LG Optimus LTE SU640: force restart: hold Power for 15–30 seconds
If still looping: enter Recovery Mode
Navigate to 'Wipe cache partition' → confirm → reboot
If still looping: return to Recovery
Select 'Wipe data/factory reset' → confirm (erases all data)
Last resort: use your manufacturer's PC tool to reinstall firmware
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