[LG G6 ROMs, Kernels, Recoveries, & Other Developme] JW09I4:
Please provide where in the G6 warranty it says the warranty is void if flashing non-OEM firmware?

To my knowledge, no manufacturer has this in their hardware warranty, now or ever. Before making "warranty void" statements, it helps to consult what the actual warranty says, not what one's opinion is or what some random customer service employee said. The only statements that matter regarding what voids a warranty are the ones directly from the manufacturer listed in black and white in the warranty provided to the consumer.

Smartphones do not come with a software warranty, they come with a hardware warranty, and in order for a hardware warranty to be voided, the hardware itself must be damaged - flashing an OS does not damage hardware, even if done incorrectly.

LG lists three things, and only three things, that will void the hardware warranty (pages 1, 155, & 168) as well as twelve items it will not cover under warranty:

Page 1:

"Modifying the device’s operating system or installing software from unofficial sources may damage the device and lead to data corruption or data loss. Such actions will violate your LG license agreement and void your warranty."

Folks often fail to read the entire sentence, which states that if hardware damage occurs due to modifying the OS or using other software, that, and only that, woukd void the warranty; e.g. if you modify CPU parameters and clock speeds via software and that fries your motherboard, that would not be covered, however flashing an OS does not damage hardware - at worst you could get a device stuck in EDL mode, hardbricking it, but even that isn't hardware damage.

Page 155:

"Any changes or modifications not expressly approved in this user guide could void your warranty for this equipment."

Simply put, warranty law is clear in the US at least and unless it's specifically spelled out by a manufacturer what specifically voids their warranty, such a statement is unenforceable. In the US, warranties are regulated by each state's Dept. of Insurance, and they have teeth, whereas the FTC usually does not. For example, the DoI can revoke a businesses license to sell or provide warranties in their state, of which affects sales, and since phone OEMs are usually publicly owned, publicly owned companies generally don't go out of their way to anger share holders or participate in malfeasance that would substantially affect profits.

As mentioned above, don't take folk's opinions, incl. mine, over what's written - if any believe this statement on 155 could be enforceable if you flash your device with open source firmware, call your state's Dept. of Insurance and file a complaint asking for specifically this question in referenxe to this statement on p155, because by law, companies must respond within 30 days or they'll be fined by the DoI. (It's likely other countries have similar institutions that regulate warranties.)

Page 168: (battery only)

"Please use only an approved charging accessory to charge your LG device. Improper handling of the charging port, as well as the use of an incompatible charger, may cause damage to your device and void the warranty."

Page 181:

THIS LIMITED WARRANTY DOES NOT COVER:

Damage or defects of the Product resulting from use of the Product in other than its normal and customary manner.

Damage or defects of the Product resulting from abnormal use, abnormal conditions, improper storage, exposure to moisture or dampness, unauthorized modifications/connection/repair, misuse, neglect, abuse, accident, alteration, improper installation, or other acts which are not the fault of LG, including damage or defects of the Product caused by shipping, blown fuses, spills of food or liquid.

Damage or defects of the Product caused by transportation and/or handling, including scratches, dents, chips, and/or other damage to the finish of your Product including the external housing and cosmetic parts, unless such damage results from defects in materials or workmanship and is reported within one (1) week of delivery (Call: 1-800-793-8896).

Damage or defects to antennas unless caused directly by defects in material or workmanship.

Damage or defects of the Product resulting from operating the Product contrary to the instructions outlined in the Product owner’s manual.

That LG Customer Service was not notified by you of the alleged defect or malfunction of the Product during the applicable limited warranty period.

Products with original serial numbers that have been removed, altered, or cannot be readily determined.

Damage or defects of the Product or missing items to any Product sold “As Is”, “With all Faults” or similar ddisclaimer

Damage or defect of the Product caused by the use of accessories, parts, consumable cleaning products, or service not provided or approved by LG.

All plastic surfaces and all other externally exposed parts that are scratched or damaged.

Products operated outside published maximum ratings.

Replacement of any consumable parts (such as fuses).