The opposite is true: It is what happens on all Android phones with all Android versions, unless the phone ROM has been specifically modded to eliminate this problem. If you got the impression that lack of extFAT or NTFS support is maybe a fluke that might occur only to some Android brands, or only with older Android versions, this is totally not the case. But this is simply not a standard option. You have probably heard people report about being successful with that. This is of course not denying that, as mentioned, people with custom ROMs and/or rooted phones can use NTFS on their SD cards and get Kiwix to work. Mobile Kiwix is dead for Wikipedia and Project Gutenberg. This leaves only one conclusion: Generally speaking large ZIM files do not work on Android, Kiwix does not work without ZIM files.As I understand it, Kiwix has long been in a state where it is not expected to be able to reliably deal with any sort of splitting of files. I was not even able to open Wikipedia mini with Kiwix-desktop, after I split the 12GB ZIM file properly and regularly with zim-tools, and I left the 5GB part at the end (search index) as it was. Also by reading other issues I got the strong impression, that split file support has been dropped and left in the codebase only as an unmaintained remnant. So without the search index you can't search anything in the file anymore, which makes this hack highly unviable. This would be necessary for the files to still work at all, but it renders those parts useless. I was told that as an ugly hack, you can still use unixtools to split those unsplitable parts. This is because they all contain certain internal parts, most notably the "search index", which is always destined to easily exceed the 4GB limit in direct proportion to the size of the ZIM file, even in ZIM files as small as 12GB (e.g. Wikipedia) cannot and could never be split into chunks smaller than 4GB. To most users who store much much more than just Wikipedia on their SD card, this is just highly inacceptable and why the card still needs to be FAT32 in all cases up to this day with all phones that don't run modified ROMs. Thus if formatted in this manner, the card can never ever be used on any external device no matter what operating system or tools you use, the data can never be backed up in a safe and direct way, and basically your SD card's data is lost if the phone dies or any other hardware problems arise. In unrooted stock Android, there is no option or trick to decrypt a once encrpyted SD card (but on certain newer Samsung phones there is). In regular unrooted Android, and I believe in all versions of it as well, if the phone has been once encrypted (which is the default for most phones since years and years and it can't be reversed), the SD card is automatically also encrpyted if not formatted as FAT32, but as "internal storage" (i.e. Also highly unusual is how Samsung's custom ROMs handle encryption on SD cards. This is highly unusual, even within the Samsung brand many Samsung phone models may not even have this modification and Samsung might drop it any time, e.g. Very very very few if any but one or two manufacturers use custom preinstalled ROMs, such as Samsung, modified to have NTFS and extFAT enabled for SD cards. Also rooting your phone nowadays requires wiping the entire phone first. on, they void your warranty and they require you to root your phone, which is often not possible without resorting to shady untrusted recovery image blobs for less popular phone brands. Only custom ROMs may support different file systems, if that has been specifically added as a feature different from the default Android behavior, which is to reject any file system other than FAT32 (even though the kernel obviously has support). It is entirely untrue that extFAT, NTFS or even ext4 are available options in stock Android, both to recent and also obsolete Android versions. Any and all regular Android phones do not support any other file system than FAT32 on SD cards and thus require ZIM files to be split into chunks that are smaller than 4GB in order to work at all.Here is what I know to be true about that: From what I have gathered, the support of split zim files has been dropped entirely, because it didn't really work to begin with.
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