Update README (#23)

* 12.5.4

* A12+ devices
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@ -137,7 +137,7 @@ Use jailbreak tools for setting boot-nonce generator:
1. [Meridian](https://meridian.sparkes.zone) for iOS 10.x;
2. [backr00m](https://nito.tv) or greeng0blin for tvOS 10.2-11.1;
3. [Electra and ElectraTV](https://coolstar.org/electra) for iOS and tvOS 11.x;
4. [Chimera and ChimeraTV](https://chimera.sh) for iOS 12.0-12.2, 12.4 and tvOS 12.0-12.2, 12.4.
4. [Chimera and ChimeraTV](https://chimera.sh) for iOS 12.0-12.5.4 (Nonce setter only supports on 12.1.2 - 12.4.1 on A12, and 12.1.3 - 12.5.4 is only supported on A7 - A11 devices.)
5. [Odyssey](https://theodyssey.dev/) for iOS 13.0-13.7
- Note that there are some reported issues with Odyssey's generator setter. Using it is not recommended.
6. [Taurine](https://taurine.app/) for iOS 14.0-14.3
@ -147,11 +147,13 @@ Use jailbreak tools for setting boot-nonce generator:
Currently you can restore to the following versions with the latest SEP and baseband for your device:
A7 and A8: 11.3-12.5.3
A7 and A8: 11.3-12.5.4
A9 and A10: 14.0-14.6
A11 devices and newer: 14.3-14.6
A11 devices: 14.3-14.6
A12 devices and newer: 14.0-14.6
---
@ -199,7 +201,7 @@ This is an error that has been diagnosed but no fix for it is available as of th
- **Device with A7 chip on iOS 9.1 - 10.2 or iOS 10.3 beta 1**;
- Jailbreak isn't required;
- Signing ticket files (`.shsh`, `.shsh2`, `.plist`) with a custom ApNonce;
- Signing ticket files needs to have one of the ApNonces, which the device generates a lot;
- Signing ticket files needs to have one of the APNonces which the device generates a lot;
### Info
You can downgrade if the destination firmware version, if it is compatible with the [latest sep and baseband!](#firmware-signing-info). You also need to have **special signing ticket files**. If you don't know what this is, you probably can **NOT** use this method!
@ -236,7 +238,7 @@ You can downgrade if the destination firmware version, if it is compatible with
__If ApNonce is not collisioned, "use hands" for DFU booting.__
__If ApNonce is successfully coliisioned, use this SHSH2 for sign iBSS/iBEC.__
__If ApNonce is successfully collisioned, use this SHSH2 to sign iBSS/iBEC.__
5. Use img4tool for sign iBSS:
`img4tool -s ticket.shsh -c iBSS.signed -p <original_iBSS>`;
6. Use img4tool for sign iBEC: