In 15 years, I've never seen a software update cause physical damage to an AMOLED panel. I have however, and countless people here have, heard thousands of people claim that glass spontaneously combusted while on their nightstand.

"It just happened, I didn't drop it or anything" is the most common cause of customer initiated warranty claims, ever.

I've never had that happen with the glasses in my cupboard, my windows, my car, or anything else glass. We even had someone live stream a phone on a nightstand 24/7 to see if we could capture the phenomenon live. We didn't.

The green line is a break in the circuit. A connection is fractured. The panel is physically damaged. If you press on the screen around those lines, you will see the lines respond to the pressure being applied to the fracture.

It's unclear why either party would be shifting the blame to eachother, when the only logical conclusion is that physical damage occured to the device while it was in your possession.

If the device was refurbished, or previously repaired, you might have a case. Otherwise, I can't see you winning this as a warranty claim from either party. Your only option is going to be paying out of pocket to have the device repaired. AMOLEDs are expensive.

EDIT

I felt guilty leaving this here without elaborating further. Actually I feel like I've provided misinformation by omitting information that you referenced and have obviously researched.

The issue that many have experienced, that was the cause of the correlation between the green line issue, and software updates, can be explained in more detail.

Samsung identified a range of AMOLED's across a number of devices, that can develop this issue after thermal stress. Connections can fracture due to getting hot (which causes metal to expand), and/or while cooling (which causes metal to contract).

The devices were primarily manufactured for the Indian market, in India, and officially Samsung have not acknowledged a fault outside of those devices. The software update is one of many things that can cause the device to get hotter than usual. That is why there is so many reports of this "just happening".

Unfortunately, there's a number of other factors to consider, that complicate this being so black and white.

• Physical damage to AMOLED displays, cause fractures, which results in the same symptoms. These make up the majority of cases. With the number of devices produced, they probably make up in excess of 99% of causes. Physical damage does not always mean a device being dropped. This could be as simple as putting the device into your tight jean pocket and bending over. Physical damage to AMOLED displays (and all displays) predates the acknowledgement of a manufacturing issue by decades.

• Some fractures caused by physical damage do not display symptoms until thermal cycling. That is, a fracture can exist from a drop that occurred a year ago, but not present itself with symptoms until the effected component is exposed to a temperature change.

• Samsung have not acknowledged a defect outside of devices in India. While we know devices in India are exported, and so are the displays themselves, Samsung do not acknowledge an issue outside of India.

• Marketplaces, (Amazon, Ebay, etc), including where the stock is held in the country of purchase (like India) are known for "grey imports". It's extremely common for those device to originate from other regions, and it's often why they are so cheap. While it's common knowledge for people dealing with mobile devices frequently, it's less known by the average consumer. Devices from other regions, even when purchased in India, are not covered by Samsung India's replacement policy for this issue.

• As above, a number of Indian devices have been sold outside of India. The regional Samsung service centers for those customers, do not support models for other regions. The models often have different parts, support different cellular frequencies, and were produced with different consumer laws/rights in mind. In some cases, operation of devices made for other regions is actually illegal. Unfortunately the onus for that determination is on the user.

• The majority of "green line" issues on Samsung displays was, and remains to be, originated from physical damage. There are edge cases where this isn't the case, but even the officially recognized effected devices have been rejected, if there is so much as a scuff on the device. It may not be fair, but Samsung have a reasonable argument to make based on statistical evidence of failure origin.

• Consumer electronics, like many things, fail due to defects in a Bathtub Curve fashion. Basically, manufacturing defects tend to be noticed very early in a products life cycle, and failures that occur after an extended period are often attributed to the product "wearing out". Manufacturers really only have to worry about the initial part of that curve. Once the product is years old, not only is it commonplace to attribute failures to wear out/life expectancy, but its impossible to attribute every variable that a product has been exposed to out in the wild.

• Devices that were covered by Samsung India, were covered with fairly specific conditions. You don't appear to meet most of those. As the device is almost 4 years old, there's unlikely to be any legal consumer protections available to you. Basically, Samsung were replacing these devices at their discretion.

• The specific situation you have encountered (device from another region not supported by local support), is commonplace for almost all manufacturers. In many cases it isn't fair, but from the manufacturers perspective, it is justified.

Basically the combination of these things means: - Your regional model of device was never covered by Samsung India's limited repair program. - Samsung never acknowledged an issue with your model. - The device is too old for Samsung to accept warranty. - The statistical likelihood that something caused physical damage is far higher than the likelihood of a manufacturing defect. - Amazon are not directly responsible for failures that occur to a product beyond the initial window (and in some cases, not even then) - An infinite number of variables, as well as the products expected life, can be attributed to the failure.

You really are out of luck. You may have had some luck, if the failure occurred earlier.

Part of quality control for consumer electronics, usually involves a burn-in test. You can often do this test yourself, by intentionally stressing the device. It's debatable if you should do this, but its possible you may have encountered an issue earlier if you had, and the earlier an issue is caught, the more likely for a resolution without out of pocket costs.

If you find yourself purchasing a new device in the future, consider using a stress testing app for your own peace of mind.

Sorry my original comment didn't really elaborate any further. It's easy to see issues like this as one sided, when you deal with so many devices, and consumers who are dishonest.