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Difference between revisions of "PROD"
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+ | The '''PROD''' ('''PRODuction''') tag is a bit value that denotes if the image/ticket signature is for production devices or not. It is present in the SHSH certificate img3 and APTicket. When set to <code>true</code>, the image is designated to be installed onto production and development devices. When the tag value is <code>false</code>, the image/ticket is only explicitly accepted on [[Prototypes|internal devices]]. This is enforced through [[iBoot (Bootloader)|iBoot]]'s <code>do_load_image(void);</code> routine. The routine skips the '''PROD''' tag check if the device's fuse value is <code>false</code>. |
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− | Denotes if the firmware image should be used on a production mode device or not. Obviously, this is set to 1 on all firmwares, while assumed to be set to 0 on debug / engineering devices. |
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+ | This is to prevent production devices from running non-production code. |
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− | Is also set to 0 on 3GS unspecialized firmwares(w/o ECID) |
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+ | [[Category:Firmware Tags]] |
Latest revision as of 19:35, 16 July 2015
The PROD (PRODuction) tag is a bit value that denotes if the image/ticket signature is for production devices or not. It is present in the SHSH certificate img3 and APTicket. When set to true
, the image is designated to be installed onto production and development devices. When the tag value is false
, the image/ticket is only explicitly accepted on internal devices. This is enforced through iBoot's do_load_image(void);
routine. The routine skips the PROD tag check if the device's fuse value is false
.
This is to prevent production devices from running non-production code.