Anti-rollback/ARB for device firmware - Revision history

Rudxain: link & fmt: fastboot

2026-04-26T21:50:56Z

link & fmt: fastboot

← Older revision		Revision as of 21:50, 26 April 2026
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	==How it works==		==How it works==
	In the case of Xiaomi Verified Boot has a rollback index which is compared with the rollback index of the ROM that you are about to flash.<ref name=":0">{{Cite web \|author=Sheist! \|date=2024-03-20 \|title=Anti-rollback (Google and Xiaomi): what it means and what is important \|url=https://xdaforums.com/t/anti-rollback-google-and-xiaomi-what-it-means-and-what-is-important.4662801/ \|url-status=live \|archive-url=https://web.archive.org/web/20250311094357/https://xdaforums.com/t/anti-rollback-google-and-xiaomi-what-it-means-and-what-is-important.4662801/ \|archive-date=2025-03-11 \|access-date=2026-02-19 \|website=XDA Forums}}</ref> If the current rollback index on your device is less than the rollback index in the ROM to be flashed, then the ROM will be flashed without any issues and the current rollback index will be increased to match the new rollback index [of the just flashed ROM].<ref name=":0" /> If the current rollback index on your device is equal to the rollback index in the ROM to be flashed, then the ROM will be flashed and there will be no change in the rollback index.<ref name=":0" /> If the current rollback index is greater than the rollback index in the ROM to be flashed, then the ROM will be rejected. But this will only happen if you’re flashing via fastboot or Mi Flash.<ref name=":0" />		In the case of Xiaomi Verified Boot has a rollback index which is compared with the rollback index of the ROM that you are about to flash.<ref name=":0">{{Cite web \|author=Sheist! \|date=2024-03-20 \|title=Anti-rollback (Google and Xiaomi): what it means and what is important \|url=https://xdaforums.com/t/anti-rollback-google-and-xiaomi-what-it-means-and-what-is-important.4662801/ \|url-status=live \|archive-url=https://web.archive.org/web/20250311094357/https://xdaforums.com/t/anti-rollback-google-and-xiaomi-what-it-means-and-what-is-important.4662801/ \|archive-date=2025-03-11 \|access-date=2026-02-19 \|website=XDA Forums}}</ref> If the current rollback index on your device is less than the rollback index in the ROM to be flashed, then the ROM will be flashed without any issues and the current rollback index will be increased to match the new rollback index [of the just flashed ROM].<ref name=":0" /> If the current rollback index on your device is equal to the rollback index in the ROM to be flashed, then the ROM will be flashed and there will be no change in the rollback index.<ref name=":0" /> If the current rollback index is greater than the rollback index in the ROM to be flashed, then the ROM will be rejected. But this will only happen if you’re flashing via <code>[[wikipedia:Fastboot\|fastboot]]</code> or Mi Flash.<ref name=":0" />

	==Why it is a problem==		==Why it is a problem==
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	*[[Oneplus phone update introduces hardware anti-rollback]]		*[[Oneplus phone update introduces hardware anti-rollback]]

	== See also ==		==See also==

	* [[Secure boot]]		*[[Secure boot]]

	==References==		==References==

Rudxain: Add "See also" with "Secure boot"

2026-04-26T21:48:50Z

Add "See also" with "Secure boot"

← Older revision		Revision as of 21:48, 26 April 2026
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	==Why it is a problem==		==Why it is a problem==

	# Denys users from being able to willingly downgrade to previous firmware		#Denys users from being able to willingly downgrade to previous firmware
	# If the new firmware creates problems, the ability to fix the problem through rollback is unavailable		#If the new firmware creates problems, the ability to fix the problem through rollback is unavailable

	==Examples==		==Examples==

	* [[Oneplus phone update introduces hardware anti-rollback]]		*[[Oneplus phone update introduces hardware anti-rollback]]

			== See also ==

			* [[Secure boot]]

	==References==		==References==

Mr Pollo at 15:58, 6 March 2026

2026-03-06T15:58:26Z

← Older revision		Revision as of 15:58, 6 March 2026
Line 2:		Line 2:

	==How it works==		==How it works==
	In the case of ~~[https://xdaforums.com/t/anti-rollback-google-and-xiaomi-what-it-means-and-what-is-important.4662801/~~ Xiaomi] Verified Boot has a rollback index which is compared with the rollback index of the ROM that you are about to flash.<ref name=":0">{{Cite web \|~~first~~=Sheist! \|date=2024-03-20 \|title=Anti-rollback (Google and Xiaomi): what it means and what is important \|url=https://xdaforums.com/t/anti-rollback-google-and-xiaomi-what-it-means-and-what-is-important.4662801/ \|url-status=live \|archive-url=https://web.archive.org/web/20250311094357/https://xdaforums.com/t/anti-rollback-google-and-xiaomi-what-it-means-and-what-is-important.4662801/ \|archive-date=2025-03-11 \|access-date=2026-02-19 \|website=XDA Forums}}</ref> If the current rollback index on your device is less than the rollback index in the ROM to be flashed, then the ROM will be flashed without any issues and the current rollback index will be increased to match the new rollback index [of the just flashed ROM].<ref name=":0" /> If the current rollback index on your device is equal to the rollback index in the ROM to be flashed, then the ROM will be flashed and there will be no change in the rollback index.<ref name=":0" /> If the current rollback index is greater than the rollback index in the ROM to be flashed, then the ROM will be rejected. But this will only happen if you’re flashing via fastboot or Mi Flash.<ref name=":0" />		In the case of Xiaomi Verified Boot has a rollback index which is compared with the rollback index of the ROM that you are about to flash.<ref name=":0">{{Cite web \|author=Sheist! \|date=2024-03-20 \|title=Anti-rollback (Google and Xiaomi): what it means and what is important \|url=https://xdaforums.com/t/anti-rollback-google-and-xiaomi-what-it-means-and-what-is-important.4662801/ \|url-status=live \|archive-url=https://web.archive.org/web/20250311094357/https://xdaforums.com/t/anti-rollback-google-and-xiaomi-what-it-means-and-what-is-important.4662801/ \|archive-date=2025-03-11 \|access-date=2026-02-19 \|website=XDA Forums}}</ref> If the current rollback index on your device is less than the rollback index in the ROM to be flashed, then the ROM will be flashed without any issues and the current rollback index will be increased to match the new rollback index [of the just flashed ROM].<ref name=":0" /> If the current rollback index on your device is equal to the rollback index in the ROM to be flashed, then the ROM will be flashed and there will be no change in the rollback index.<ref name=":0" /> If the current rollback index is greater than the rollback index in the ROM to be flashed, then the ROM will be rejected. But this will only happen if you’re flashing via fastboot or Mi Flash.<ref name=":0" />

	==Why it is a problem==		==Why it is a problem==

FlaminHotGarbage: Created a description for the theme, explained how it works, why it is a problem, provided an example and gave a reference

2026-02-20T04:57:08Z

Created a description for the theme, explained how it works, why it is a problem, provided an example and gave a reference

New page

Anti-rollback, or ARB, for device firmware is a feature of some devices that prevents the device from booting if it detects that the device has been downgraded to an older, unapproved software build. This prevents attackers from loading older software on a device that’s susceptible to an exploit. However, some people prefer to use an older version of the firmware, and many support the ability to backtrack or downgrade to a previous build or edition. However, many companies have created devices that prevent rolling back to the previous firmware.

==How it works==
In the case of [https://xdaforums.com/t/anti-rollback-google-and-xiaomi-what-it-means-and-what-is-important.4662801/ Xiaomi] Verified Boot has a rollback index which is compared with the rollback index of the ROM that you are about to flash.<ref name=":0">{{Cite web |first=Sheist! |date=2024-03-20 |title=Anti-rollback (Google and Xiaomi): what it means and what is important |url=https://xdaforums.com/t/anti-rollback-google-and-xiaomi-what-it-means-and-what-is-important.4662801/ |url-status=live |archive-url=https://web.archive.org/web/20250311094357/https://xdaforums.com/t/anti-rollback-google-and-xiaomi-what-it-means-and-what-is-important.4662801/ |archive-date=2025-03-11 |access-date=2026-02-19 |website=XDA Forums}}</ref> If the current rollback index on your device is less than the rollback index in the ROM to be flashed, then the ROM will be flashed without any issues and the current rollback index will be increased to match the new rollback index [of the just flashed ROM].<ref name=":0" /> If the current rollback index on your device is equal to the rollback index in the ROM to be flashed, then the ROM will be flashed and there will be no change in the rollback index.<ref name=":0" /> If the current rollback index is greater than the rollback index in the ROM to be flashed, then the ROM will be rejected. But this will only happen if you’re flashing via fastboot or Mi Flash.<ref name=":0" />

==Why it is a problem==

# Denys users from being able to willingly downgrade to previous firmware
# If the new firmware creates problems, the ability to fix the problem through rollback is unavailable

==Examples==

* [[Oneplus phone update introduces hardware anti-rollback]]

==References==
{{reflist}}

[[Category:Common terms]]