How?
So, how did this even happen? I was scrolling on Vinted randomly, and I saw this advertising of this Sony Xperia 5 V at 200€. At that moment I thought "it's a scam", but my curiosity helped me to send a message to the guy to understand better if it was reliable or not. Since his profile was curated, with different positive reviews and the guy itself was kind and available to reply, I've purchased without even trying to lower the price, paying a total of about 215€ with delivery and warranty of the platform.
The phone itself
The package arrived, I opened it and... surprise! There was a real box of an Xperia 5 V with 2 cases and not a rock! The phone looks immaculate, not a single scratch or point or the slightest sign of damage, literally like brand new in the box, and it also has a glass screen protector already applied on it that is basically new. I've checked how many charging cycles the battery has, just by downloading the app " Device info HW" and I was even more surprised when I read "149 Cycles", so basically a battery with only about 5 to 7 months of usage!
Recommendations
Now guys I don't know what to do, I've configured the phone, everything works flawlessly, and strangely I like this Android Stock OS. Should I unlock the bootloader and put a custom ROM like LineageOS to have a better experience, or even with the stock Android of Sony with Android 15 is enough? Do you guys have any general or particular recommendations for this model?
Reselling price
If I decide to resell this phone how much do you think I can ask? I've searched everywhere to find another Xperia 5 V, Wallapop, Vinted, Subito.it, but I've found only one on eBay for around 600€ that is sold as a refurbished one. The alternative would be to buy one on Amazon "used in good condition" at about 700-750€, but of course realistically speaking nobody would pay that amount of money for this phone. Since it's like a unicorn here in Europe (I'm in Spain), could I ask more just because it's impossible to find one?
The only issue
This phone has only one issue, like all Xperia phones apparently... The fingerprint reader works 1 time out of 5 to unlock it, while using it to unlock apps or for privacy reasons (like app security) it works perfectly. I know it's a well known issue, and probably it's also the software that doesn't help, maybe for a strict security procedure, but realistically what can I do about giving up about it?