Is there any danger in flashing a phone?

Question

Android

Hello, I want to flash a Samsung i5700 Galaxy Spica smartphone to the latest version of Android, this is the first time I have encountered this. I figured out how to do this, but there was one question left, if suddenly something goes wrong at the time of the firmware, for example, some kind of error, or just a banal power outage, will I not ruin my phone at the software level and is it reversible? Thank you.
PS Yes, I'm paranoid.

Answer 1

A couple of tips regarding the firmware of any devices.
First, fully charge the battery and test it.
Secondly, if possible, use the UPS and a laptop.
Thirdly, most electronic devices provide an initial firmware interface (JTAG or otherwise), the software part of which is usually contained in a flash ROM, which is usually written only in soldered form.
And so it doesn't get damaged.
Fourthly, paranoid people usually do not sew themselves, but go to the service. Often in an authorized service this is done for free.

Answer 2

In the service center, you will be restored with a 99% probability. Well, 1% always remains ... :-)

Answer 3

Usually, flashing the main system comes from Recovery, while recovery itself is loaded, working and does not overwrite itself. That is, if something goes wrong during the firmware, you can always reboot into the same Recovery and flash it again. However, my experience here is based solely on working with HTC devices, for Sony-Ericsson Xperia, for example, the firmware is made by a program on a computer via USB - I don’t know what problems may arise there. It is best to read the XDA Developers forum section on your phone - there is sure to be the necessary information there.

Answer 4

Thanks guys for the advice, I'm sewing :)