re-flashing factory partition

[alsaleem00]

I configured my partition table with
- factory partition.
- one ota partition
(also using - custom bootloader)

The reason for not having two ota's is that my ota app is large and the 4MB flash can not hold ota0+ota1 (ota app ~ 2.1MB). Thus, created a factory app (~1MB) to re-flash the ota app. Factory is flashing new ota apps from a bin file in sdcard.

In rare case and in controlled setup, I need to re-flash the factory partition by ota app.
When I used the ota functions

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upd_part = esp_partition_find_first(ESP_PARTITION_TYPE_APP, ESP_PARTITION_SUBTYPE_APP_FACTORY, NULL);

I get the correct factory partition location, but

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esp_ota_begin(upd_part, OTA_SIZE_UNKNOWN, &update_handle);

returns invalid argument error. I guess this is because it is the factory partition, right?

Is there a way to make (esp_ota_begin) accepts operation even if it is the factory?
Thanks.

[alsaleem00]

I was able to re-flash the factory partition using the API

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esp_partition_erase_range();
esp_partition_write();

Thanks!