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Format of the IFWI file:

1. MIP block
2. IFWI block (x86 code and data)
3. Primary Security Firmare 1 (arc compact code, loading address seems to be 0xFF800000)
4. Secondary security firmware
5. Primary security firmware 2
6. Video encode/decode firmware
7. SUCP block
8. uph header: Signature Sizes of blocks 1,2,3,5,4,7,6 in DWords Xor sum of previous 8 fields of uph header

Ifwi versions known to work on Ramos i9:

1. Original Ramos i9 version. F9.db
2. Flipkart xt901 kitkat 4.4 version f9.ee
3. Teclast p90 (h3u6) version f9.db (different from 1)

This repository mentions IFWI_vF9.DB_CRAK_DEV.bin

https://github.com/huashuolee/tools/blob/c9cea4f03b6b5af5ee22452e076d6eb7a65c5d8b/RAMOSI9S-mkota-config.txt