getprop("ro.product.device") == "merlin" || abort("E3004: This package is for \"merlin\" devices; this is a \"" + getprop("ro.product.device") + "\".");
ui_print("Source: Redmi/merlin_in/merlin:10/QP1A.190711.020/V12.0.2.0.QJOINXM:user/release-keys");
ui_print("Target: Redmi/merlin_in/merlin:10/QP1A.190711.020/V12.0.4.0.QJOINXM:user/release-keys");
ui_print("Verifying current system...");
getprop("ro.build.fingerprint") == "Redmi/merlin_in/merlin:10/QP1A.190711.020/V12.0.2.0.QJOINXM:user/release-keys" ||
    getprop("ro.build.fingerprint") == "Redmi/merlin_in/merlin:10/QP1A.190711.020/V12.0.4.0.QJOINXM:user/release-keys" ||
    abort("E3001: Package expects build fingerprint of Redmi/merlin_in/merlin:10/QP1A.190711.020/V12.0.2.0.QJOINXM:user/release-keys or Redmi/merlin_in/merlin:10/QP1A.190711.020/V12.0.4.0.QJOINXM:user/release-keys; this device has " + getprop("ro.build.fingerprint") + ".");
show_progress(0.100000, 10);
patch_partition_check("EMMC:/dev/block/platform/bootdevice/by-name/boot:67108864:e4fed5476c0095625a5868c6276287c2879d4adb",
                      "EMMC:/dev/block/platform/bootdevice/by-name/boot:67108864:d422cbd80f88680579267c8577871acd5a60f820") ||
    abort("E3005: \"EMMC:/dev/block/platform/bootdevice/by-name/boot:67108864:e4fed5476c0095625a5868c6276287c2879d4adb\" or \"EMMC:/dev/block/platform/bootdevice/by-name/boot:67108864:d422cbd80f88680579267c8577871acd5a60f820\" has unexpected contents.");
apply_patch_space(91611136) || abort("E3006: Not enough free space on /cache to apply patches.");
patch_partition_check("EMMC:/dev/block/platform/bootdevice/by-name/md1img:58113152:5de648ecd0733e03381d77f08558ed56f325ea52",
                      "EMMC:/dev/block/platform/bootdevice/by-name/md1img:58082656:d0acd60fbd7f988dac243342bdb0fdd457fd719c") ||
    abort("E3005: \"EMMC:/dev/block/platform/bootdevice/by-name/md1img:58113152:5de648ecd0733e03381d77f08558ed56f325ea52\" or \"EMMC:/dev/block/platform/bootdevice/by-name/md1img:58082656:d0acd60fbd7f988dac243342bdb0fdd457fd719c\" has unexpected contents.");
apply_patch_space(58113152) || abort("E3006: Not enough free space on /cache to apply patches.");
show_progress(0.100000, 70);
if (range_sha1(map_partition("system"), "42,1,32770,32933,34197,34213,34215,34221,98306,98469,112189,131072,131092,131093,131094,132010,132012,132216,163842,164005,169768,170691,170693,170719,229378,229541,294914,295077,383999,384141,498448,502446,506879,524288,524368,532330,622610,622612,655361,655380,668537,670549,680728") == "48fde53e4fb331ce0508bcfa28d42daa1167dce8" || block_image_verify(map_partition("system"), package_extract_file("system.transfer.list"), "system.new.dat", "system.patch.dat")) then
ui_print("Verified system image...");
else
check_first_block(map_partition("system"));
ifelse (block_image_recover(map_partition("system"), "42,1,32770,32933,34197,34213,34215,34221,98306,98469,112189,131072,131092,131093,131094,132010,132012,132216,163842,164005,169768,170691,170693,170719,229378,229541,294914,295077,383999,384141,498448,502446,506879,524288,524368,532330,622610,622612,655361,655380,668537,670549,680728") && block_image_verify(map_partition("system"), package_extract_file("system.transfer.list"), "system.new.dat", "system.patch.dat"), ui_print("system recovered successfully."), abort("E1004: system partition fails to recover"));
endif;
if (range_sha1(map_partition("vendor"), "66,1,79,816,822,840,841,846,847,849,850,1364,1365,1367,1368,1528,1529,1540,1544,1548,1549,1765,1766,1845,1846,1916,1917,2102,2103,2181,2182,2261,2262,2341,2342,3228,3229,3263,3301,4718,4719,5674,5684,6442,6447,7466,7467,8541,8545,8546,8548,8549,8551,10804,10806,10813,10815,13894,32770,32809,98306,98345,161581,162135,164706,164756,164757") == "8e07cd7d024943930e2842cdffcb31f4ef76cf37" || block_image_verify(map_partition("vendor"), package_extract_file("vendor.transfer.list"), "vendor.new.dat", "vendor.patch.dat")) then
ui_print("Verified vendor image...");
else
check_first_block(map_partition("vendor"));
ifelse (block_image_recover(map_partition("vendor"), "66,1,79,816,822,840,841,846,847,849,850,1364,1365,1367,1368,1528,1529,1540,1544,1548,1549,1765,1766,1845,1846,1916,1917,2102,2103,2181,2182,2261,2262,2341,2342,3228,3229,3263,3301,4718,4719,5674,5684,6442,6447,7466,7467,8541,8545,8546,8548,8549,8551,10804,10806,10813,10815,13894,32770,32809,98306,98345,161581,162135,164706,164756,164757") && block_image_verify(map_partition("vendor"), package_extract_file("vendor.transfer.list"), "vendor.new.dat", "vendor.patch.dat"), ui_print("vendor recovered successfully."), abort("E2004: vendor partition fails to recover"));
endif;
if (range_sha1(map_partition("product"), "16,1,32770,32827,98306,98363,163842,163899,229378,229435,229440,229442,232941,233640,237345,237406,237407") == "460ce6ae41151fd92df16f45284ae37f42a0c69f" || block_image_verify(map_partition("product"), package_extract_file("product.transfer.list"), "product.new.dat", "product.patch.dat")) then
ui_print("Verified product image...");
else
ifelse (block_image_recover(map_partition("product"), "16,1,32770,32827,98306,98363,163842,163899,229378,229435,229440,229442,232941,233640,237345,237406,237407") && block_image_verify(map_partition("product"), package_extract_file("product.transfer.list"), "product.new.dat", "product.patch.dat"), ui_print("product recovered successfully."), abort("E2004: product partition fails to recover"));
endif;

# ---- start making changes here ----

ui_print("Patching boot image...");
show_progress(0.100000, 10);
patch_partition("EMMC:/dev/block/platform/bootdevice/by-name/boot:67108864:e4fed5476c0095625a5868c6276287c2879d4adb",
                "EMMC:/dev/block/platform/bootdevice/by-name/boot:67108864:d422cbd80f88680579267c8577871acd5a60f820",
                package_extract_file("boot.img.p")) ||
    abort("E3008: Failed to apply patch to EMMC:/dev/block/platform/bootdevice/by-name/boot:67108864:d422cbd80f88680579267c8577871acd5a60f820");
show_progress(0.600000, 600);

# --- Start patching dynamic partitions ---


# Patch partition system

ui_print("Patching system image after verification.");
block_image_update(map_partition("system"), package_extract_file("system.transfer.list"), "system.new.dat", "system.patch.dat") ||
  abort("E1001: Failed to update system image.");

# Update dynamic partition metadata

assert(update_dynamic_partitions(package_extract_file("dynamic_partitions_op_list")));

# Patch partition product

ui_print("Patching product image after verification.");
block_image_update(map_partition("product"), package_extract_file("product.transfer.list"), "product.new.dat", "product.patch.dat") ||
  abort("E2001: Failed to update product image.");

# Patch partition vendor

ui_print("Patching vendor image after verification.");
block_image_update(map_partition("vendor"), package_extract_file("vendor.transfer.list"), "vendor.new.dat", "vendor.patch.dat") ||
  abort("E2001: Failed to update vendor image.");

# --- End patching dynamic partitions ---

show_progress(0.100000, 2);
show_mtupdate_stage("/cache/recovery/last_mtupdate_stage");
ifelse (
less_than_int(get_mtupdate_stage("/cache/recovery/last_mtupdate_stage"), "1") ,
(
ui_print("start to update general image");
package_extract_file("logo.bin", "/dev/block/platform/bootdevice/by-name/logo");
package_extract_file("dtbo.img", "/dev/block/platform/bootdevice/by-name/dtbo");
package_extract_file("exaid.img", "/dev/block/platform/bootdevice/by-name/exaid");
ui_print("Patching md1img image...");
show_progress(0.100000, 10);
patch_partition("EMMC:/dev/block/platform/bootdevice/by-name/md1img:58113152:5de648ecd0733e03381d77f08558ed56f325ea52",
                "EMMC:/dev/block/platform/bootdevice/by-name/md1img:58082656:d0acd60fbd7f988dac243342bdb0fdd457fd719c",
                package_extract_file("patch/md1img.img.p")) ||
    abort("E3008: Failed to apply patch to EMMC:/dev/block/platform/bootdevice/by-name/md1img:58082656:d0acd60fbd7f988dac243342bdb0fdd457fd719c");
package_extract_file("spmfw.img", "/dev/block/platform/bootdevice/by-name/spmfw");
set_mtupdate_stage("/cache/recovery/last_mtupdate_stage", "1");
),
ui_print("general images are already updated");
);
ifelse (
less_than_int(get_mtupdate_stage("/cache/recovery/last_mtupdate_stage"), "3") ,
(
if less_than_int(get_mtupdate_stage("/cache/recovery/last_mtupdate_stage"), "2") then

ui_print("start to update alt loader image");
package_extract_file("sspm.img", "/dev/block/platform/bootdevice/by-name/sspm_2");
package_extract_file("scp.img", "/dev/block/platform/bootdevice/by-name/scp2");
package_extract_file("lk.img", "/dev/block/platform/bootdevice/by-name/lk2");
package_extract_file("tee.img", "/dev/block/platform/bootdevice/by-name/tee2");
if get_storage_type() then 
 assert(package_extract_file("preloader_ufs.img", "/dev/block/mmcblk0boot1"));
else 
 assert(set_emmc_writable("/sys/block/mmcblk0boot1/force_ro"),
        package_extract_file("preloader_emmc.img", "/dev/block/mmcblk0boot1"));
endif;
set_mtupdate_stage("/cache/recovery/last_mtupdate_stage", "2");
endif;

switch_active("sspm_1", "sspm_2");
switch_active("scp1", "scp2");
switch_active("lk", "lk2");
switch_active("tee1", "tee2");
switch_active("preloader", "preloader2");
set_mtupdate_stage("/cache/recovery/last_mtupdate_stage", "3");
),
ui_print("alt loder images are already updated");
);
ifelse (
less_than_int(get_mtupdate_stage("/cache/recovery/last_mtupdate_stage"), "5") ,
(
if less_than_int(get_mtupdate_stage("/cache/recovery/last_mtupdate_stage"), "4") then

ui_print("start to update main loader image");
package_extract_file("sspm.img", "/dev/block/platform/bootdevice/by-name/sspm_1");
package_extract_file("scp.img", "/dev/block/platform/bootdevice/by-name/scp1");
package_extract_file("lk.img", "/dev/block/platform/bootdevice/by-name/lk");
package_extract_file("tee.img", "/dev/block/platform/bootdevice/by-name/tee1");
if get_storage_type() then 
 assert(package_extract_file("preloader_ufs.img", "/dev/block/mmcblk0boot0"));
else 
 assert(set_emmc_writable("/sys/block/mmcblk0boot0/force_ro"),
        package_extract_file("preloader_emmc.img", "/dev/block/mmcblk0boot0"));
endif;
set_mtupdate_stage("/cache/recovery/last_mtupdate_stage", "4");
endif;

switch_active("sspm_2", "sspm_1");
switch_active("scp2", "scp1");
switch_active("lk2", "lk");
switch_active("tee2", "tee1");
switch_active("preloader2", "preloader");
),
ui_print("main loader images are already updated");
);
delete("/cache/recovery/last_mtupdate_stage");
package_extract_file("vbmeta_system.img", "/dev/block/platform/bootdevice/by-name/vbmeta_system");
package_extract_file("vbmeta.img", "/dev/block/platform/bootdevice/by-name/vbmeta");
package_extract_file("vbmeta_vendor.img", "/dev/block/platform/bootdevice/by-name/vbmeta_vendor");
post_ota_action();
