Root cause
If you have experienced a persistent boot loop issue after the 6.1 update, it is highly likely that your phone is already ruined, and there is nothing you can do through software fixes or tricks to resolve this issue permanently. Your phone is bricked.
Samsung's software update caused a prolonged boot loop for many devices. This boot loop overheated the CPU and damaged the connection between the motherboard and the solder balls of the CPU, especially in phones using low-quality Exynos processors (Samsung's own CPU). While CPUs can technically be reballed, finding a repair shop capable of performing this complicated process is extremely difficult, as it requires advanced skills and equipment.
CPUs are generally tested against heat damage and are designed to shut themselves off when overheating occurs. However, in certain scenarios, such as exposure to external forces like sunlight or when safety mechanisms fail during the early stages of CPU initialization, this protection may not activate in time. The constant boot loop caused by the software update impacted the CPU, subjecting it to extreme stress levels in the early phase of initialization that caused permanent damage to the soldered balls of the chip. This destructive "boot loop cycle" combined with the lower quality of Exynos CPUs, practically guarantees that affected devices will fail.
Solution
Raise and articulate your issue through Samsung's "Email the CEO's Office" communication channel, even if your warranty has expired. Samsung Service Centers lack the decision-making authority to escalate such issues, or they simply may not care enough. I have personally tried reaching them, but they were of no help at all, only "Member Stars" here are more unhelpful, ignorant, unwilling, reluctant about this issue than them. They will neither represent you nor take responsibility for resolving this issue.
You need to take the initiative and directly point out to Samsung that this problem exists. If they confirm that your phone was indeed damaged due to their software update, they may repair it free of charge (replace the entire motherboard where the CPU embedded). It is unfortunate that customers must go the extra mile to receive proper service and cannot rely on a trustworthy experience after their once perfectly functioning phone was ruined overnight by a software update.
Raise your issue, post about it, visit service centers, email the CEO’s office, start a conciliation process, or even pursue legal action if necessary. For me, the "Email the CEO's Office" option (link here , you might need the version of this page local to your country, I am from Europe) was effective in getting my phone repaired.
