.lrc. Some newer players have a slot for SD/MMC cards of capacities from 32 MB to 4 GB. Firmware upgrade tool for Windows. Logo customization via Chinese-language software or firmware hacks. Software utilities Available utilities for Microsoft Windows include an ACT to WAV file converter (for files recorded on the device), a basic desktop editor to enter contact details for the device's phone book function and device drivers for Windows 98. An 8 cm CD-ROM containing some or all of these is included with some versions of the device. There are also tools developed by individuals under the Open-Source license, such as s1res ans s1clone that allow the consumer to modify its device by changing bitmaps and text. By using decompilers, it is possible to add and replace features of the device, steps that were described on the s1mp3.org wiki page. Firmware update issues The firmware used in various S1 MP3 players differs significantly, but this is not widely understood. Problems have arisen as consumers have attempted to upgrade their players using incompatible firmware with a higher version number. This can damage the players almost permanently. However, a 'dead' player can sometimes be recovered by opening it, shorting some pins and uploading a full firmware from the PC. Guides on recovering the players were available on a unofficial website s1mp3.org that is offline since 2019. Example models and brands The following are brand names in alphabetical order. Due to common mold specifications of the player type, this list will never be complete. Atak M971, M972 Cat — Not to be confused with Caterpillar Inc. Centon Coby Daewoo International MP3 Players Delstar Denver Electronics (Denmark) DIGIQuest DMTF17 dnt DSE MP3/WMA Players (A5384: 2GB version) Element Electronics ePro (Digital MP3 Player) Explay c300 Foehn & Hirsch MA588 Foston Gigamax Hip Street 2GB I-Spirit InnoAX iMX-120 INOVIX IMP-97 (and other models) Invion JFF Nano (Digital MP3/4 Player) Kaiomy Lark Smile LASER (badged as generic, no model name) LG UP3# (also styled as UP3-SHARP) — Uses the FAT32 filesystem, supports MP3, WMA (including MS-DRM), ASF and OGG audio formats. Has a built-in USB-rechargeable battery. The detailed FAQ also refers to firmware updates from the LG website. Mach Trio 2 GB MaxSpeed Medion TEVION 1GB Sports MP3 player - (Smart Group) Identifies as "Productor Wilson Co. Ltd." - Version 3.5.35. (Supports Ogg Vorbis) Medion TEVION 1GB/2GB MP4 player - (fascin8) - Firmware Version 9.1.51.0005 Mithus