Why can't you downgrade the firmware?


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But I wonder, for many phones (smartphones), you cannot downgrade the firmware, otherwise the phone "the body" which is then almost impossible to restore. Why?
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backward compatibility. Newer versions can digest these older, the reverse is not true.
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Officially not, and so the "downgrade" to have 90% of the tubes and devices. The official rejection of such an operation is associated, rather, with the inability to migrate the user settings to the "old" firmware + deep confidence of the manufacturer in the formula: "new = safe".
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>But I wonder, for many phones (smartphones)
who told you that ?? phones without problems are made to the firmware that is right for them prednazanacheny, and above or below purple. For smartum, too, think the problems special should not to arise (unless "stuchlik" like when IOS iPhones)
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Very often in a firmware update not included all manner of ROM-and, but only some updated modules. Moreover, in the previous firmware can be alone modules, and in the new.
For good, if firmware a lot, you have to start from the first reference and progressively to flash one after the other, stopping at the desired stage.
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Here, too, the degree with the drinking of alcohol. Going to lower in the morning will only get worse. So only boost, and nothing else.
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there are bootloder is the body firmware
so, if the new firmware includes a new bootloader, when firmware background it modified it in the background.
and firmware old firmware(even with the old bum) due to the nature of the specific device may not flash the old bootloader, and leaves zilch — a new quitter can not(or will not) run the old body firmware.
In such a situation, well, when old slacker provides emergency flooded with correct body firmware(for example when clamping of the conditional keys selects from the root of the SD card the body of the firmware and injects the flash)
But there are variations when intentionally or stupidity of the developer, and may be specifically due to regionlock and other stuff a slacker does not provide for such emergency procedure — then the body goes on JTAG-firmware all flushes.
Behind this, we need to look at a particular model of iron, and understand ourselves in the situation, and the ways out of it
For example if you take htc t5353 and flash it alternative a quitter, you can lower or raise or even to shed the incorrect firmware only manage after flashing to do a full reset, and in case of failure to lift the body from the SD cart
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