If I get along with the possible limitations of a device, I do not upgrade it.
I learned this more than 20 years ago, when a FW upgrade (the only irreversible one) ruined the ability of my best and back then insanely expensive CD-drive to read through protections.
I have a T1, a T2, and a T3, the "extremes" also in original covers, and I have no major problems at all (only some wishes). They also have ADE onboard, like Kobo.
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